diff --git a/Doc/sgml/iso/ISOamsa b/Doc/sgml/iso/ISOamsa
new file mode 100644
index 0000000..b77154c
--- /dev/null
+++ b/Doc/sgml/iso/ISOamsa
@@ -0,0 +1,66 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOamsa PUBLIC
+       "ISO 8879:1986//ENTITIES Added Math Symbols: Arrow Relations//EN">
+     %ISOamsa;
+-->
+<!ENTITY cularr SDATA "[cularr]"--/curvearrowleft A: left curved arrow -->
+<!ENTITY curarr SDATA "[curarr]"--/curvearrowright A: rt curved arrow -->
+<!ENTITY dArr   SDATA "[dArr  ]"--/Downarrow A: down dbl arrow -->
+<!ENTITY darr2  SDATA "[darr2 ]"--/downdownarrows A: two down arrows -->
+<!ENTITY dharl  SDATA "[dharl ]"--/downleftharpoon A: dn harpoon-left -->
+<!ENTITY dharr  SDATA "[dharr ]"--/downrightharpoon A: down harpoon-rt -->
+<!ENTITY lAarr  SDATA "[lAarr ]"--/Lleftarrow A: left triple arrow -->
+<!ENTITY Larr   SDATA "[Larr  ]"--/twoheadleftarrow A:-->
+<!ENTITY larr2  SDATA "[larr2 ]"--/leftleftarrows A: two left arrows -->
+<!ENTITY larrhk SDATA "[larrhk]"--/hookleftarrow A: left arrow-hooked -->
+<!ENTITY larrlp SDATA "[larrlp]"--/looparrowleft A: left arrow-looped -->
+<!ENTITY larrtl SDATA "[larrtl]"--/leftarrowtail A: left arrow-tailed -->
+<!ENTITY lhard  SDATA "[lhard ]"--/leftharpoondown A: l harpoon-down -->
+<!ENTITY lharu  SDATA "[lharu ]"--/leftharpoonup A: left harpoon-up -->
+<!ENTITY hArr   SDATA "[hArr  ]"--/Leftrightarrow A: l&r dbl arrow -->
+<!ENTITY harr   SDATA "[harr  ]"--/leftrightarrow A: l&r arrow -->
+<!ENTITY lrarr2 SDATA "[lrarr2]"--/leftrightarrows A: l arr over r arr -->
+<!ENTITY rlarr2 SDATA "[rlarr2]"--/rightleftarrows A: r arr over l arr -->
+<!ENTITY harrw  SDATA "[harrw ]"--/leftrightsquigarrow A: l&r arr-wavy -->
+<!ENTITY rlhar2 SDATA "[rlhar2]"--/rightleftharpoons A: r harp over l -->
+<!ENTITY lrhar2 SDATA "[lrhar2]"--/leftrightharpoons A: l harp over r -->
+<!ENTITY lsh    SDATA "[lsh   ]"--/Lsh A:-->
+<!ENTITY map    SDATA "[map   ]"--/mapsto A:-->
+<!ENTITY mumap  SDATA "[mumap ]"--/multimap A:-->
+<!ENTITY nearr  SDATA "[nearr ]"--/nearrow A: NE pointing arrow -->
+<!ENTITY nlArr  SDATA "[nlArr ]"--/nLeftarrow A: not implied by -->
+<!ENTITY nlarr  SDATA "[nlarr ]"--/nleftarrow A: not left arrow -->
+<!ENTITY nhArr  SDATA "[nhArr ]"--/nLeftrightarrow A: not l&r dbl arr -->
+<!ENTITY nharr  SDATA "[nharr ]"--/nleftrightarrow A: not l&r arrow -->
+<!ENTITY nrarr  SDATA "[nrarr ]"--/nrightarrow A: not right arrow -->
+<!ENTITY nrArr  SDATA "[nrArr ]"--/nRightarrow A: not implies -->
+<!ENTITY nwarr  SDATA "[nwarr ]"--/nwarrow A: NW pointing arrow -->
+<!ENTITY olarr  SDATA "[olarr ]"--/circlearrowleft A: l arr in circle -->
+<!ENTITY orarr  SDATA "[orarr ]"--/circlearrowright A: r arr in circle -->
+<!ENTITY rAarr  SDATA "[rAarr ]"--/Rrightarrow A: right triple arrow -->
+<!ENTITY Rarr   SDATA "[Rarr  ]"--/twoheadrightarrow A:-->
+<!ENTITY rarr2  SDATA "[rarr2 ]"--/rightrightarrows A: two rt arrows -->
+<!ENTITY rarrhk SDATA "[rarrhk]"--/hookrightarrow A: rt arrow-hooked -->
+<!ENTITY rarrlp SDATA "[rarrlp]"--/looparrowright A: rt arrow-looped -->
+<!ENTITY rarrtl SDATA "[rarrtl]"--/rightarrowtail A: rt arrow-tailed -->
+<!ENTITY rarrw  SDATA "[rarrw ]"--/squigarrowright A: rt arrow-wavy -->
+<!ENTITY rhard  SDATA "[rhard ]"--/rightharpoondown A: rt harpoon-down -->
+<!ENTITY rharu  SDATA "[rharu ]"--/rightharpoonup A: rt harpoon-up -->
+<!ENTITY rsh    SDATA "[rsh   ]"--/Rsh A:-->
+<!ENTITY drarr  SDATA "[drarr ]"--/searrow A: downward rt arrow -->
+<!ENTITY dlarr  SDATA "[dlarr ]"--/swarrow A: downward l arrow -->
+<!ENTITY uArr   SDATA "[uArr  ]"--/Uparrow A: up dbl arrow -->
+<!ENTITY uarr2  SDATA "[uarr2 ]"--/upuparrows A: two up arrows -->
+<!ENTITY vArr   SDATA "[vArr  ]"--/Updownarrow A: up&down dbl arrow -->
+<!ENTITY varr   SDATA "[varr  ]"--/updownarrow A: up&down arrow -->
+<!ENTITY uharl  SDATA "[uharl ]"--/upleftharpoon A: up harpoon-left -->
+<!ENTITY uharr  SDATA "[uharr ]"--/uprightharpoon A: up harp-r-->
+<!ENTITY xlArr  SDATA "[xlArr ]"--/Longleftarrow A: long l dbl arrow -->
+<!ENTITY xhArr  SDATA "[xhArr ]"--/Longleftrightarrow A: long l&r dbl arr-->
+<!ENTITY xharr  SDATA "[xharr ]"--/longleftrightarrow A: long l&r arr -->
+<!ENTITY xrArr  SDATA "[xrArr ]"--/Longrightarrow A: long rt dbl arr -->
diff --git a/Doc/sgml/iso/ISOamsb b/Doc/sgml/iso/ISOamsb
new file mode 100644
index 0000000..43944a7
--- /dev/null
+++ b/Doc/sgml/iso/ISOamsb
@@ -0,0 +1,52 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOamsb PUBLIC
+       "ISO 8879:1986//ENTITIES Added Math Symbols: Binary Operators//EN">
+     %ISOamsb;
+-->
+<!ENTITY amalg  SDATA "[amalg ]"--/amalg B: amalgamation or coproduct-->
+<!ENTITY Barwed SDATA "[Barwed]"--/doublebarwedge B: log and, dbl bar-->
+<!ENTITY barwed SDATA "[barwed]"--/barwedge B: logical and, bar above-->
+<!ENTITY Cap    SDATA "[Cap   ]"--/Cap /doublecap B: dbl intersection-->
+<!ENTITY Cup    SDATA "[Cup   ]"--/Cup /doublecup B: dbl union-->
+<!ENTITY cuvee  SDATA "[cuvee ]"--/curlyvee B: curly logical or-->
+<!ENTITY cuwed  SDATA "[cuwed ]"--/curlywedge B: curly logical and-->
+<!ENTITY diam   SDATA "[diam  ]"--/diamond B: open diamond-->
+<!ENTITY divonx SDATA "[divonx]"--/divideontimes B: division on times-->
+<!ENTITY intcal SDATA "[intcal]"--/intercal B: intercal-->
+<!ENTITY lthree SDATA "[lthree]"--/leftthreetimes B:-->
+<!ENTITY ltimes SDATA "[ltimes]"--/ltimes B: times sign, left closed-->
+<!ENTITY minusb SDATA "[minusb]"--/boxminus B: minus sign in box-->
+<!ENTITY oast   SDATA "[oast  ]"--/circledast B: asterisk in circle-->
+<!ENTITY ocir   SDATA "[ocir  ]"--/circledcirc B: open dot in circle-->
+<!ENTITY odash  SDATA "[odash ]"--/circleddash B: hyphen in circle-->
+<!ENTITY odot   SDATA "[odot  ]"--/odot B: middle dot in circle-->
+<!ENTITY ominus SDATA "[ominus]"--/ominus B: minus sign in circle-->
+<!ENTITY oplus  SDATA "[oplus ]"--/oplus B: plus sign in circle-->
+<!ENTITY osol   SDATA "[osol  ]"--/oslash B: solidus in circle-->
+<!ENTITY otimes SDATA "[otimes]"--/otimes B: multiply sign in circle-->
+<!ENTITY plusb  SDATA "[plusb ]"--/boxplus B: plus sign in box-->
+<!ENTITY plusdo SDATA "[plusdo]"--/dotplus B: plus sign, dot above-->
+<!ENTITY rthree SDATA "[rthree]"--/rightthreetimes B:-->
+<!ENTITY rtimes SDATA "[rtimes]"--/rtimes B: times sign, right closed-->
+<!ENTITY sdot   SDATA "[sdot  ]"--/cdot B: small middle dot-->
+<!ENTITY sdotb  SDATA "[sdotb ]"--/dotsquare /boxdot B: small dot in box-->
+<!ENTITY setmn  SDATA "[setmn ]"--/setminus B: reverse solidus-->
+<!ENTITY sqcap  SDATA "[sqcap ]"--/sqcap B: square intersection-->
+<!ENTITY sqcup  SDATA "[sqcup ]"--/sqcup B: square union-->
+<!ENTITY ssetmn SDATA "[ssetmn]"--/smallsetminus B: sm reverse solidus-->
+<!ENTITY sstarf SDATA "[sstarf]"--/star B: small star, filled-->
+<!ENTITY timesb SDATA "[timesb]"--/boxtimes B: multiply sign in box-->
+<!ENTITY top    SDATA "[top   ]"--/top B: inverted perpendicular-->
+<!ENTITY uplus  SDATA "[uplus ]"--/uplus B: plus sign in union-->
+<!ENTITY wreath SDATA "[wreath]"--/wr B: wreath product-->
+<!ENTITY xcirc  SDATA "[xcirc ]"--/bigcirc B: large circle-->
+<!ENTITY xdtri  SDATA "[xdtri ]"--/bigtriangledown B: big dn tri, open-->
+<!ENTITY xutri  SDATA "[xutri ]"--/bigtriangleup B: big up tri, open-->
+<!ENTITY coprod SDATA "[coprod]"--/coprod L: coproduct operator-->
+<!ENTITY prod   SDATA "[prod  ]"--/prod L: product operator-->
+<!ENTITY sum    SDATA "[sum   ]"--/sum L: summation operator-->
diff --git a/Doc/sgml/iso/ISOamsc b/Doc/sgml/iso/ISOamsc
new file mode 100644
index 0000000..06222d5
--- /dev/null
+++ b/Doc/sgml/iso/ISOamsc
@@ -0,0 +1,20 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOamsc PUBLIC
+       "ISO 8879:1986//ENTITIES Added Math Symbols: Delimiters//EN">
+     %ISOamsc;
+-->
+<!ENTITY rceil  SDATA "[rceil ]"--/rceil C: right ceiling-->
+<!ENTITY rfloor SDATA "[rfloor]"--/rfloor C: right floor-->
+<!ENTITY rpargt SDATA "[rpargt]"--/rightparengtr C: right paren, gt-->
+<!ENTITY urcorn SDATA "[urcorn]"--/urcorner C: upper right corner-->
+<!ENTITY drcorn SDATA "[drcorn]"--/lrcorner C: downward right corner-->
+<!ENTITY lceil  SDATA "[lceil ]"--/lceil O: left ceiling-->
+<!ENTITY lfloor SDATA "[lfloor]"--/lfloor O: left floor-->
+<!ENTITY lpargt SDATA "[lpargt]"--/leftparengtr O: left parenthesis, gt-->
+<!ENTITY ulcorn SDATA "[ulcorn]"--/ulcorner O: upper left corner-->
+<!ENTITY dlcorn SDATA "[dlcorn]"--/llcorner O: downward left corner-->
diff --git a/Doc/sgml/iso/ISOamsn b/Doc/sgml/iso/ISOamsn
new file mode 100644
index 0000000..0c8327a
--- /dev/null
+++ b/Doc/sgml/iso/ISOamsn
@@ -0,0 +1,70 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOamsn PUBLIC
+       "ISO 8879:1986//ENTITIES
+        Added Math Symbols: Negated Relations//EN">
+     %ISOamsn;
+-->
+<!ENTITY gnap   SDATA "[gnap  ]"--/gnapprox N: greater, not approximate-->
+<!ENTITY gne    SDATA "[gne   ]"--/gneq N: greater, not equals-->
+<!ENTITY gnE    SDATA "[gnE   ]"--/gneqq N: greater, not dbl equals-->
+<!ENTITY gnsim  SDATA "[gnsim ]"--/gnsim N: greater, not similar-->
+<!ENTITY gvnE   SDATA "[gvnE  ]"--/gvertneqq N: gt, vert, not dbl eq-->
+<!ENTITY lnap   SDATA "[lnap  ]"--/lnapprox N: less, not approximate-->
+<!ENTITY lnE    SDATA "[lnE   ]"--/lneqq N: less, not double equals-->
+<!ENTITY lne    SDATA "[lne   ]"--/lneq N: less, not equals-->
+<!ENTITY lnsim  SDATA "[lnsim ]"--/lnsim N: less, not similar-->
+<!ENTITY lvnE   SDATA "[lvnE  ]"--/lvertneqq N: less, vert, not dbl eq-->
+<!ENTITY nap    SDATA "[nap   ]"--/napprox N: not approximate-->
+<!ENTITY ncong  SDATA "[ncong ]"--/ncong N: not congruent with-->
+<!ENTITY nequiv SDATA "[nequiv]"--/nequiv N: not identical with-->
+<!ENTITY ngE    SDATA "[ngE   ]"--/ngeqq N: not greater, dbl equals-->
+<!ENTITY nge    SDATA "[nge   ]"--/ngeq N: not greater-than-or-equal-->
+<!ENTITY nges   SDATA "[nges  ]"--/ngeqslant N: not gt-or-eq, slanted-->
+<!ENTITY ngt    SDATA "[ngt   ]"--/ngtr N: not greater-than-->
+<!ENTITY nle    SDATA "[nle   ]"--/nleq N: not less-than-or-equal-->
+<!ENTITY nlE    SDATA "[nlE   ]"--/nleqq N: not less, dbl equals-->
+<!ENTITY nles   SDATA "[nles  ]"--/nleqslant N: not less-or-eq, slant-->
+<!ENTITY nlt    SDATA "[nlt   ]"--/nless N: not less-than-->
+<!ENTITY nltri  SDATA "[nltri ]"--/ntriangleleft N: not left triangle-->
+<!ENTITY nltrie SDATA "[nltrie]"--/ntrianglelefteq N: not l tri, eq-->
+<!ENTITY nmid   SDATA "[nmid  ]"--/nmid-->
+<!ENTITY npar   SDATA "[npar  ]"--/nparallel N: not parallel-->
+<!ENTITY npr    SDATA "[npr   ]"--/nprec N: not precedes-->
+<!ENTITY npre   SDATA "[npre  ]"--/npreceq N: not precedes, equals-->
+<!ENTITY nrtri  SDATA "[nrtri ]"--/ntriangleright N: not rt triangle-->
+<!ENTITY nrtrie SDATA "[nrtrie]"--/ntrianglerighteq N: not r tri, eq-->
+<!ENTITY nsc    SDATA "[nsc   ]"--/nsucc N: not succeeds-->
+<!ENTITY nsce   SDATA "[nsce  ]"--/nsucceq N: not succeeds, equals-->
+<!ENTITY nsim   SDATA "[nsim  ]"--/nsim N: not similar-->
+<!ENTITY nsime  SDATA "[nsime ]"--/nsimeq N: not similar, equals-->
+<!ENTITY nsmid  SDATA "[nsmid ]"--/nshortmid-->
+<!ENTITY nspar  SDATA "[nspar ]"--/nshortparallel N: not short par-->
+<!ENTITY nsub   SDATA "[nsub  ]"--/nsubset N: not subset-->
+<!ENTITY nsube  SDATA "[nsube ]"--/nsubseteq N: not subset, equals-->
+<!ENTITY nsubE  SDATA "[nsubE ]"--/nsubseteqq N: not subset, dbl eq-->
+<!ENTITY nsup   SDATA "[nsup  ]"--/nsupset N: not superset-->
+<!ENTITY nsupE  SDATA "[nsupE ]"--/nsupseteqq N: not superset, dbl eq-->
+<!ENTITY nsupe  SDATA "[nsupe ]"--/nsupseteq N: not superset, equals-->
+<!ENTITY nvdash SDATA "[nvdash]"--/nvdash N: not vertical, dash-->
+<!ENTITY nvDash SDATA "[nvDash]"--/nvDash N: not vertical, dbl dash-->
+<!ENTITY nVDash SDATA "[nVDash]"--/nVDash N: not dbl vert, dbl dash-->
+<!ENTITY nVdash SDATA "[nVdash]"--/nVdash N: not dbl vertical, dash-->
+<!ENTITY prnap  SDATA "[prnap ]"--/precnapprox N: precedes, not approx-->
+<!ENTITY prnE   SDATA "[prnE  ]"--/precneqq N: precedes, not dbl eq-->
+<!ENTITY prnsim SDATA "[prnsim]"--/precnsim N: precedes, not similar-->
+<!ENTITY scnap  SDATA "[scnap ]"--/succnapprox N: succeeds, not approx-->
+<!ENTITY scnE   SDATA "[scnE  ]"--/succneqq N: succeeds, not dbl eq-->
+<!ENTITY scnsim SDATA "[scnsim]"--/succnsim N: succeeds, not similar-->
+<!ENTITY subne  SDATA "[subne ]"--/subsetneq N: subset, not equals-->
+<!ENTITY subnE  SDATA "[subnE ]"--/subsetneqq N: subset, not dbl eq-->
+<!ENTITY supne  SDATA "[supne ]"--/supsetneq N: superset, not equals-->
+<!ENTITY supnE  SDATA "[supnE ]"--/supsetneqq N: superset, not dbl eq-->
+<!ENTITY vsubnE SDATA "[vsubnE]"--/subsetneqq N: subset not dbl eq, var-->
+<!ENTITY vsubne SDATA "[vsubne]"--/subsetneq N: subset, not eq, var-->
+<!ENTITY vsupne SDATA "[vsupne]"--/supsetneq N: superset, not eq, var-->
+<!ENTITY vsupnE SDATA "[vsupnE]"--/supsetneqq N: super not dbl eq, var-->
diff --git a/Doc/sgml/iso/ISOamso b/Doc/sgml/iso/ISOamso
new file mode 100644
index 0000000..ad9b329
--- /dev/null
+++ b/Doc/sgml/iso/ISOamso
@@ -0,0 +1,29 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOamso PUBLIC
+       "ISO 8879:1986//ENTITIES Added Math Symbols: Ordinary//EN">
+     %ISOamso;
+-->
+<!ENTITY ang    SDATA "[ang   ]"--/angle - angle-->
+<!ENTITY angmsd SDATA "[angmsd]"--/measuredangle - angle-measured-->
+<!ENTITY beth   SDATA "[beth  ]"--/beth - beth, Hebrew-->
+<!ENTITY bprime SDATA "[bprime]"--/backprime - reverse prime-->
+<!ENTITY comp   SDATA "[comp  ]"--/complement - complement sign-->
+<!ENTITY daleth SDATA "[daleth]"--/daleth - daleth, Hebrew-->
+<!ENTITY ell    SDATA "[ell   ]"--/ell - cursive small l-->
+<!ENTITY empty  SDATA "[empty ]"--/emptyset /varnothing =small o, slash-->
+<!ENTITY gimel  SDATA "[gimel ]"--/gimel - gimel, Hebrew-->
+<!ENTITY image  SDATA "[image ]"--/Im - imaginary-->
+<!ENTITY inodot SDATA "[inodot]"--/imath =small i, no dot-->
+<!ENTITY jnodot SDATA "[jnodot]"--/jmath - small j, no dot-->
+<!ENTITY nexist SDATA "[nexist]"--/nexists - negated exists-->
+<!ENTITY oS     SDATA "[oS    ]"--/circledS - capital S in circle-->
+<!ENTITY planck SDATA "[planck]"--/hbar /hslash - Planck's over 2pi-->
+<!ENTITY real   SDATA "[real  ]"--/Re - real-->
+<!ENTITY sbsol  SDATA "[sbsol ]"--/sbs - short reverse solidus-->
+<!ENTITY vprime SDATA "[vprime]"--/varprime - prime, variant-->
+<!ENTITY weierp SDATA "[weierp]"--/wp - Weierstrass p-->
diff --git a/Doc/sgml/iso/ISOamsr b/Doc/sgml/iso/ISOamsr
new file mode 100644
index 0000000..3f26c34
--- /dev/null
+++ b/Doc/sgml/iso/ISOamsr
@@ -0,0 +1,94 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOamsr PUBLIC
+       "ISO 8879:1986//ENTITIES Added Math Symbols: Relations//EN">
+     %ISOamsr;
+-->
+<!ENTITY ape    SDATA "[ape   ]"--/approxeq R: approximate, equals-->
+<!ENTITY asymp  SDATA "[asymp ]"--/asymp R: asymptotically equal to-->
+<!ENTITY bcong  SDATA "[bcong ]"--/backcong R: reverse congruent-->
+<!ENTITY bepsi  SDATA "[bepsi ]"--/backepsilon R: such that-->
+<!ENTITY bowtie SDATA "[bowtie]"--/bowtie R:-->
+<!ENTITY bsim   SDATA "[bsim  ]"--/backsim R: reverse similar-->
+<!ENTITY bsime  SDATA "[bsime ]"--/backsimeq R: reverse similar, eq-->
+<!ENTITY bump   SDATA "[bump  ]"--/Bumpeq R: bumpy equals-->
+<!ENTITY bumpe  SDATA "[bumpe ]"--/bumpeq R: bumpy equals, equals-->
+<!ENTITY cire   SDATA "[cire  ]"--/circeq R: circle, equals-->
+<!ENTITY colone SDATA "[colone]"--/coloneq R: colon, equals-->
+<!ENTITY cuepr  SDATA "[cuepr ]"--/curlyeqprec R: curly eq, precedes-->
+<!ENTITY cuesc  SDATA "[cuesc ]"--/curlyeqsucc R: curly eq, succeeds-->
+<!ENTITY cupre  SDATA "[cupre ]"--/curlypreceq R: curly precedes, eq-->
+<!ENTITY dashv  SDATA "[dashv ]"--/dashv R: dash, vertical-->
+<!ENTITY ecir   SDATA "[ecir  ]"--/eqcirc R: circle on equals sign-->
+<!ENTITY ecolon SDATA "[ecolon]"--/eqcolon R: equals, colon-->
+<!ENTITY eDot   SDATA "[eDot  ]"--/doteqdot /Doteq R: eq, even dots-->
+<!ENTITY esdot  SDATA "[esdot ]"--/doteq R: equals, single dot above-->
+<!ENTITY efDot  SDATA "[efDot ]"--/fallingdotseq R: eq, falling dots-->
+<!ENTITY egs    SDATA "[egs   ]"--/eqslantgtr R: equal-or-gtr, slanted-->
+<!ENTITY els    SDATA "[els   ]"--/eqslantless R: eq-or-less, slanted-->
+<!ENTITY erDot  SDATA "[erDot ]"--/risingdotseq R: eq, rising dots-->
+<!ENTITY fork   SDATA "[fork  ]"--/pitchfork R: pitchfork-->
+<!ENTITY frown  SDATA "[frown ]"--/frown R: down curve-->
+<!ENTITY gap    SDATA "[gap   ]"--/gtrapprox R: greater, approximate-->
+<!ENTITY gsdot  SDATA "[gsdot ]"--/gtrdot R: greater than, single dot-->
+<!ENTITY gE     SDATA "[gE    ]"--/geqq R: greater, double equals-->
+<!ENTITY gel    SDATA "[gel   ]"--/gtreqless R: greater, equals, less-->
+<!ENTITY gEl    SDATA "[gEl   ]"--/gtreqqless R: gt, dbl equals, less-->
+<!ENTITY ges    SDATA "[ges   ]"--/geqslant R: gt-or-equal, slanted-->
+<!ENTITY Gg     SDATA "[Gg    ]"--/ggg /Gg /gggtr R: triple gtr-than-->
+<!ENTITY gl     SDATA "[gl    ]"--/gtrless R: greater, less-->
+<!ENTITY gsim   SDATA "[gsim  ]"--/gtrsim R: greater, similar-->
+<!ENTITY Gt     SDATA "[Gt    ]"--/gg R: dbl greater-than sign-->
+<!ENTITY lap    SDATA "[lap   ]"--/lessapprox R: less, approximate-->
+<!ENTITY ldot   SDATA "[ldot  ]"--/lessdot R: less than, with dot-->
+<!ENTITY lE     SDATA "[lE    ]"--/leqq R: less, double equals-->
+<!ENTITY lEg    SDATA "[lEg   ]"--/lesseqqgtr R: less, dbl eq, greater-->
+<!ENTITY leg    SDATA "[leg   ]"--/lesseqgtr R: less, eq, greater-->
+<!ENTITY les    SDATA "[les   ]"--/leqslant R: less-than-or-eq, slant-->
+<!ENTITY lg     SDATA "[lg    ]"--/lessgtr R: less, greater-->
+<!ENTITY Ll     SDATA "[Ll    ]"--/Ll /lll /llless R: triple less-than-->
+<!ENTITY lsim   SDATA "[lsim  ]"--/lesssim R: less, similar-->
+<!ENTITY Lt     SDATA "[Lt    ]"--/ll R: double less-than sign-->
+<!ENTITY ltrie  SDATA "[ltrie ]"--/trianglelefteq R: left triangle, eq-->
+<!ENTITY mid    SDATA "[mid   ]"--/mid R:-->
+<!ENTITY models SDATA "[models]"--/models R:-->
+<!ENTITY pr     SDATA "[pr    ]"--/prec R: precedes-->
+<!ENTITY prap   SDATA "[prap  ]"--/precapprox R: precedes, approximate-->
+<!ENTITY pre    SDATA "[pre   ]"--/preceq R: precedes, equals-->
+<!ENTITY prsim  SDATA "[prsim ]"--/precsim R: precedes, similar-->
+<!ENTITY rtrie  SDATA "[rtrie ]"--/trianglerighteq R: right tri, eq-->
+<!ENTITY samalg SDATA "[samalg]"--/smallamalg R: small amalg-->
+<!ENTITY sc     SDATA "[sc    ]"--/succ R: succeeds-->
+<!ENTITY scap   SDATA "[scap  ]"--/succapprox R: succeeds, approximate-->
+<!ENTITY sccue  SDATA "[sccue ]"--/succcurlyeq R: succeeds, curly eq-->
+<!ENTITY sce    SDATA "[sce   ]"--/succeq R: succeeds, equals-->
+<!ENTITY scsim  SDATA "[scsim ]"--/succsim R: succeeds, similar-->
+<!ENTITY sfrown SDATA "[sfrown]"--/smallfrown R: small down curve-->
+<!ENTITY smid   SDATA "[smid  ]"--/shortmid R:-->
+<!ENTITY smile  SDATA "[smile ]"--/smile R: up curve-->
+<!ENTITY spar   SDATA "[spar  ]"--/shortparallel R: short parallel-->
+<!ENTITY sqsub  SDATA "[sqsub ]"--/sqsubset R: square subset-->
+<!ENTITY sqsube SDATA "[sqsube]"--/sqsubseteq R: square subset, equals-->
+<!ENTITY sqsup  SDATA "[sqsup ]"--/sqsupset R: square superset-->
+<!ENTITY sqsupe SDATA "[sqsupe]"--/sqsupseteq R: square superset, eq-->
+<!ENTITY ssmile SDATA "[ssmile]"--/smallsmile R: small up curve-->
+<!ENTITY Sub    SDATA "[Sub   ]"--/Subset R: double subset-->
+<!ENTITY subE   SDATA "[subE  ]"--/subseteqq R: subset, dbl equals-->
+<!ENTITY Sup    SDATA "[Sup   ]"--/Supset R: dbl superset-->
+<!ENTITY supE   SDATA "[supE  ]"--/supseteqq R: superset, dbl equals-->
+<!ENTITY thkap  SDATA "[thkap ]"--/thickapprox R: thick approximate-->
+<!ENTITY thksim SDATA "[thksim]"--/thicksim R: thick similar-->
+<!ENTITY trie   SDATA "[trie  ]"--/triangleq R: triangle, equals-->
+<!ENTITY twixt  SDATA "[twixt ]"--/between R: between-->
+<!ENTITY vdash  SDATA "[vdash ]"--/vdash R: vertical, dash-->
+<!ENTITY Vdash  SDATA "[Vdash ]"--/Vdash R: dbl vertical, dash-->
+<!ENTITY vDash  SDATA "[vDash ]"--/vDash R: vertical, dbl dash-->
+<!ENTITY veebar SDATA "[veebar]"--/veebar R: logical or, bar below-->
+<!ENTITY vltri  SDATA "[vltri ]"--/vartriangleleft R: l tri, open, var-->
+<!ENTITY vprop  SDATA "[vprop ]"--/varpropto R: proportional, variant-->
+<!ENTITY vrtri  SDATA "[vrtri ]"--/vartriangleright R: r tri, open, var-->
+<!ENTITY Vvdash SDATA "[Vvdash]"--/Vvdash R: triple vertical, dash-->
diff --git a/Doc/sgml/iso/ISObox b/Doc/sgml/iso/ISObox
new file mode 100644
index 0000000..643e926
--- /dev/null
+++ b/Doc/sgml/iso/ISObox
@@ -0,0 +1,62 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISObox PUBLIC
+       "ISO 8879:1986//ENTITIES Box and Line Drawing//EN">
+     %ISObox;
+-->
+<!-- All names are in the form: box1234, where:
+    box = constants that identify a box drawing entity.
+    1&2 = v, V, u, U, d, D, Ud, or uD, as follows:
+      v = vertical line for full height.
+      u = upper half of vertical line.
+      d = downward (lower) half of vertical line.
+    3&4 = h, H, l, L, r, R, Lr, or lR, as follows:
+      h = horizontal line for full width.
+      l = left half of horizontal line.
+      r = right half of horizontal line.
+    In all cases, an upper-case letter means a double or heavy line.
+-->
+<!ENTITY boxh   SDATA "[boxh  ]"--horizontal line -->
+<!ENTITY boxv   SDATA "[boxv  ]"--vertical line-->
+<!ENTITY boxur  SDATA "[boxur ]"--upper right quadrant-->
+<!ENTITY boxul  SDATA "[boxul ]"--upper left quadrant-->
+<!ENTITY boxdl  SDATA "[boxdl ]"--lower left quadrant-->
+<!ENTITY boxdr  SDATA "[boxdr ]"--lower right quadrant-->
+<!ENTITY boxvr  SDATA "[boxvr ]"--upper and lower right quadrants-->
+<!ENTITY boxhu  SDATA "[boxhu ]"--upper left and right quadrants-->
+<!ENTITY boxvl  SDATA "[boxvl ]"--upper and lower left quadrants-->
+<!ENTITY boxhd  SDATA "[boxhd ]"--lower left and right quadrants-->
+<!ENTITY boxvh  SDATA "[boxvh ]"--all four quadrants-->
+<!ENTITY boxvR  SDATA "[boxvR ]"--upper and lower right quadrants-->
+<!ENTITY boxhU  SDATA "[boxhU ]"--upper left and right quadrants-->
+<!ENTITY boxvL  SDATA "[boxvL ]"--upper and lower left quadrants-->
+<!ENTITY boxhD  SDATA "[boxhD ]"--lower left and right quadrants-->
+<!ENTITY boxvH  SDATA "[boxvH ]"--all four quadrants-->
+<!ENTITY boxH   SDATA "[boxH  ]"--horizontal line-->
+<!ENTITY boxV   SDATA "[boxV  ]"--vertical line-->
+<!ENTITY boxUR  SDATA "[boxUR ]"--upper right quadrant-->
+<!ENTITY boxUL  SDATA "[boxUL ]"--upper left quadrant-->
+<!ENTITY boxDL  SDATA "[boxDL ]"--lower left quadrant-->
+<!ENTITY boxDR  SDATA "[boxDR ]"--lower right quadrant-->
+<!ENTITY boxVR  SDATA "[boxVR ]"--upper and lower right quadrants-->
+<!ENTITY boxHU  SDATA "[boxHU ]"--upper left and right quadrants-->
+<!ENTITY boxVL  SDATA "[boxVL ]"--upper and lower left quadrants-->
+<!ENTITY boxHD  SDATA "[boxHD ]"--lower left and right quadrants-->
+<!ENTITY boxVH  SDATA "[boxVH ]"--all four quadrants-->
+<!ENTITY boxVr  SDATA "[boxVr ]"--upper and lower right quadrants-->
+<!ENTITY boxHu  SDATA "[boxHu ]"--upper left and right quadrants-->
+<!ENTITY boxVl  SDATA "[boxVl ]"--upper and lower left quadrants-->
+<!ENTITY boxHd  SDATA "[boxHd ]"--lower left and right quadrants-->
+<!ENTITY boxVh  SDATA "[boxVh ]"--all four quadrants-->
+<!ENTITY boxuR  SDATA "[boxuR ]"--upper right quadrant-->
+<!ENTITY boxUl  SDATA "[boxUl ]"--upper left quadrant-->
+<!ENTITY boxdL  SDATA "[boxdL ]"--lower left quadrant-->
+<!ENTITY boxDr  SDATA "[boxDr ]"--lower right quadrant-->
+<!ENTITY boxUr  SDATA "[boxUr ]"--upper right quadrant-->
+<!ENTITY boxuL  SDATA "[boxuL ]"--upper left quadrant-->
+<!ENTITY boxDl  SDATA "[boxDl ]"--lower left quadrant-->
+<!ENTITY boxdR  SDATA "[boxdR ]"--lower right quadrant-->
diff --git a/Doc/sgml/iso/ISOcyr1 b/Doc/sgml/iso/ISOcyr1
new file mode 100644
index 0000000..97b961b
--- /dev/null
+++ b/Doc/sgml/iso/ISOcyr1
@@ -0,0 +1,77 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOcyr1 PUBLIC
+       "ISO 8879:1986//ENTITIES Russian Cyrillic//EN">
+     %ISOcyr1;
+-->
+<!ENTITY acy    SDATA "[acy   ]"--=small a, Cyrillic-->
+<!ENTITY Acy    SDATA "[Acy   ]"--=capital A, Cyrillic-->
+<!ENTITY bcy    SDATA "[bcy   ]"--=small be, Cyrillic-->
+<!ENTITY Bcy    SDATA "[Bcy   ]"--=capital BE, Cyrillic-->
+<!ENTITY vcy    SDATA "[vcy   ]"--=small ve, Cyrillic-->
+<!ENTITY Vcy    SDATA "[Vcy   ]"--=capital VE, Cyrillic-->
+<!ENTITY gcy    SDATA "[gcy   ]"--=small ghe, Cyrillic-->
+<!ENTITY Gcy    SDATA "[Gcy   ]"--=capital GHE, Cyrillic-->
+<!ENTITY dcy    SDATA "[dcy   ]"--=small de, Cyrillic-->
+<!ENTITY Dcy    SDATA "[Dcy   ]"--=capital DE, Cyrillic-->
+<!ENTITY iecy   SDATA "[iecy  ]"--=small ie, Cyrillic-->
+<!ENTITY IEcy   SDATA "[IEcy  ]"--=capital IE, Cyrillic-->
+<!ENTITY iocy   SDATA "[iocy  ]"--=small io, Russian-->
+<!ENTITY IOcy   SDATA "[IOcy  ]"--=capital IO, Russian-->
+<!ENTITY zhcy   SDATA "[zhcy  ]"--=small zhe, Cyrillic-->
+<!ENTITY ZHcy   SDATA "[ZHcy  ]"--=capital ZHE, Cyrillic-->
+<!ENTITY zcy    SDATA "[zcy   ]"--=small ze, Cyrillic-->
+<!ENTITY Zcy    SDATA "[Zcy   ]"--=capital ZE, Cyrillic-->
+<!ENTITY icy    SDATA "[icy   ]"--=small i, Cyrillic-->
+<!ENTITY Icy    SDATA "[Icy   ]"--=capital I, Cyrillic-->
+<!ENTITY jcy    SDATA "[jcy   ]"--=small short i, Cyrillic-->
+<!ENTITY Jcy    SDATA "[Jcy   ]"--=capital short I, Cyrillic-->
+<!ENTITY kcy    SDATA "[kcy   ]"--=small ka, Cyrillic-->
+<!ENTITY Kcy    SDATA "[Kcy   ]"--=capital KA, Cyrillic-->
+<!ENTITY lcy    SDATA "[lcy   ]"--=small el, Cyrillic-->
+<!ENTITY Lcy    SDATA "[Lcy   ]"--=capital EL, Cyrillic-->
+<!ENTITY mcy    SDATA "[mcy   ]"--=small em, Cyrillic-->
+<!ENTITY Mcy    SDATA "[Mcy   ]"--=capital EM, Cyrillic-->
+<!ENTITY ncy    SDATA "[ncy   ]"--=small en, Cyrillic-->
+<!ENTITY Ncy    SDATA "[Ncy   ]"--=capital EN, Cyrillic-->
+<!ENTITY ocy    SDATA "[ocy   ]"--=small o, Cyrillic-->
+<!ENTITY Ocy    SDATA "[Ocy   ]"--=capital O, Cyrillic-->
+<!ENTITY pcy    SDATA "[pcy   ]"--=small pe, Cyrillic-->
+<!ENTITY Pcy    SDATA "[Pcy   ]"--=capital PE, Cyrillic-->
+<!ENTITY rcy    SDATA "[rcy   ]"--=small er, Cyrillic-->
+<!ENTITY Rcy    SDATA "[Rcy   ]"--=capital ER, Cyrillic-->
+<!ENTITY scy    SDATA "[scy   ]"--=small es, Cyrillic-->
+<!ENTITY Scy    SDATA "[Scy   ]"--=capital ES, Cyrillic-->
+<!ENTITY tcy    SDATA "[tcy   ]"--=small te, Cyrillic-->
+<!ENTITY Tcy    SDATA "[Tcy   ]"--=capital TE, Cyrillic-->
+<!ENTITY ucy    SDATA "[ucy   ]"--=small u, Cyrillic-->
+<!ENTITY Ucy    SDATA "[Ucy   ]"--=capital U, Cyrillic-->
+<!ENTITY fcy    SDATA "[fcy   ]"--=small ef, Cyrillic-->
+<!ENTITY Fcy    SDATA "[Fcy   ]"--=capital EF, Cyrillic-->
+<!ENTITY khcy   SDATA "[khcy  ]"--=small ha, Cyrillic-->
+<!ENTITY KHcy   SDATA "[KHcy  ]"--=capital HA, Cyrillic-->
+<!ENTITY tscy   SDATA "[tscy  ]"--=small tse, Cyrillic-->
+<!ENTITY TScy   SDATA "[TScy  ]"--=capital TSE, Cyrillic-->
+<!ENTITY chcy   SDATA "[chcy  ]"--=small che, Cyrillic-->
+<!ENTITY CHcy   SDATA "[CHcy  ]"--=capital CHE, Cyrillic-->
+<!ENTITY shcy   SDATA "[shcy  ]"--=small sha, Cyrillic-->
+<!ENTITY SHcy   SDATA "[SHcy  ]"--=capital SHA, Cyrillic-->
+<!ENTITY shchcy SDATA "[shchcy]"--=small shcha, Cyrillic-->
+<!ENTITY SHCHcy SDATA "[SHCHcy]"--=capital SHCHA, Cyrillic-->
+<!ENTITY hardcy SDATA "[hardcy]"--=small hard sign, Cyrillic-->
+<!ENTITY HARDcy SDATA "[HARDcy]"--=capital HARD sign, Cyrillic-->
+<!ENTITY ycy    SDATA "[ycy   ]"--=small yeru, Cyrillic-->
+<!ENTITY Ycy    SDATA "[Ycy   ]"--=capital YERU, Cyrillic-->
+<!ENTITY softcy SDATA "[softcy]"--=small soft sign, Cyrillic-->
+<!ENTITY SOFTcy SDATA "[SOFTcy]"--=capital SOFT sign, Cyrillic-->
+<!ENTITY ecy    SDATA "[ecy   ]"--=small e, Cyrillic-->
+<!ENTITY Ecy    SDATA "[Ecy   ]"--=capital E, Cyrillic-->
+<!ENTITY yucy   SDATA "[yucy  ]"--=small yu, Cyrillic-->
+<!ENTITY YUcy   SDATA "[YUcy  ]"--=capital YU, Cyrillic-->
+<!ENTITY yacy   SDATA "[yacy  ]"--=small ya, Cyrillic-->
+<!ENTITY YAcy   SDATA "[YAcy  ]"--=capital YA, Cyrillic-->
+<!ENTITY numero SDATA "[numero]"--=numero sign-->
diff --git a/Doc/sgml/iso/ISOcyr2 b/Doc/sgml/iso/ISOcyr2
new file mode 100644
index 0000000..480b01c
--- /dev/null
+++ b/Doc/sgml/iso/ISOcyr2
@@ -0,0 +1,36 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOcyr2 PUBLIC
+       "ISO 8879:1986//ENTITIES Non-Russian Cyrillic//EN">
+     %ISOcyr2;
+-->
+<!ENTITY djcy   SDATA "[djcy  ]"--=small dje, Serbian-->
+<!ENTITY DJcy   SDATA "[DJcy  ]"--=capital DJE, Serbian-->
+<!ENTITY gjcy   SDATA "[gjcy  ]"--=small gje, Macedonian-->
+<!ENTITY GJcy   SDATA "[GJcy  ]"--=capital GJE Macedonian-->
+<!ENTITY jukcy  SDATA "[jukcy ]"--=small je, Ukrainian-->
+<!ENTITY Jukcy  SDATA "[Jukcy ]"--=capital JE, Ukrainian-->
+<!ENTITY dscy   SDATA "[dscy  ]"--=small dse, Macedonian-->
+<!ENTITY DScy   SDATA "[DScy  ]"--=capital DSE, Macedonian-->
+<!ENTITY iukcy  SDATA "[iukcy ]"--=small i, Ukrainian-->
+<!ENTITY Iukcy  SDATA "[Iukcy ]"--=capital I, Ukrainian-->
+<!ENTITY yicy   SDATA "[yicy  ]"--=small yi, Ukrainian-->
+<!ENTITY YIcy   SDATA "[YIcy  ]"--=capital YI, Ukrainian-->
+<!ENTITY jsercy SDATA "[jsercy]"--=small je, Serbian-->
+<!ENTITY Jsercy SDATA "[Jsercy]"--=capital JE, Serbian-->
+<!ENTITY ljcy   SDATA "[ljcy  ]"--=small lje, Serbian-->
+<!ENTITY LJcy   SDATA "[LJcy  ]"--=capital LJE, Serbian-->
+<!ENTITY njcy   SDATA "[njcy  ]"--=small nje, Serbian-->
+<!ENTITY NJcy   SDATA "[NJcy  ]"--=capital NJE, Serbian-->
+<!ENTITY tshcy  SDATA "[tshcy ]"--=small tshe, Serbian-->
+<!ENTITY TSHcy  SDATA "[TSHcy ]"--=capital TSHE, Serbian-->
+<!ENTITY kjcy   SDATA "[kjcy  ]"--=small kje Macedonian-->
+<!ENTITY KJcy   SDATA "[KJcy  ]"--=capital KJE, Macedonian-->
+<!ENTITY ubrcy  SDATA "[ubrcy ]"--=small u, Byelorussian-->
+<!ENTITY Ubrcy  SDATA "[Ubrcy ]"--=capital U, Byelorussian-->
+<!ENTITY dzcy   SDATA "[dzcy  ]"--=small dze, Serbian-->
+<!ENTITY DZcy   SDATA "[DZcy  ]"--=capital dze, Serbian-->
diff --git a/Doc/sgml/iso/ISOdia b/Doc/sgml/iso/ISOdia
new file mode 100644
index 0000000..3b6f98d
--- /dev/null
+++ b/Doc/sgml/iso/ISOdia
@@ -0,0 +1,24 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOdia PUBLIC
+       "ISO 8879:1986//ENTITIES Diacritical Marks//EN">
+     %ISOdia;
+-->
+<!ENTITY acute  SDATA "[acute ]"--=acute accent-->
+<!ENTITY breve  SDATA "[breve ]"--=breve-->
+<!ENTITY caron  SDATA "[caron ]"--=caron-->
+<!ENTITY cedil  SDATA "[cedil ]"--=cedilla-->
+<!ENTITY circ   SDATA "[circ  ]"--=circumflex accent-->
+<!ENTITY dblac  SDATA "[dblac ]"--=double acute accent-->
+<!ENTITY die    SDATA "[die   ]"--=dieresis-->
+<!ENTITY dot    SDATA "[dot   ]"--=dot above-->
+<!ENTITY grave  SDATA "[grave ]"--=grave accent-->
+<!ENTITY macr   SDATA "[macr  ]"--=macron-->
+<!ENTITY ogon   SDATA "[ogon  ]"--=ogonek-->
+<!ENTITY ring   SDATA "[ring  ]"--=ring-->
+<!ENTITY tilde  SDATA "[tilde ]"--=tilde-->
+<!ENTITY uml    SDATA "[uml   ]"--=umlaut mark-->
diff --git a/Doc/sgml/iso/ISOgrk1 b/Doc/sgml/iso/ISOgrk1
new file mode 100644
index 0000000..dea16bf
--- /dev/null
+++ b/Doc/sgml/iso/ISOgrk1
@@ -0,0 +1,59 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOgrk1 PUBLIC
+       "ISO 8879:1986//ENTITIES Greek Letters//EN">
+     %ISOgrk1;
+-->
+<!ENTITY agr    SDATA "[agr   ]"--=small alpha, Greek-->
+<!ENTITY Agr    SDATA "[Agr   ]"--=capital Alpha, Greek-->
+<!ENTITY bgr    SDATA "[bgr   ]"--=small beta, Greek-->
+<!ENTITY Bgr    SDATA "[Bgr   ]"--=capital Beta, Greek-->
+<!ENTITY ggr    SDATA "[ggr   ]"--=small gamma, Greek-->
+<!ENTITY Ggr    SDATA "[Ggr   ]"--=capital Gamma, Greek-->
+<!ENTITY dgr    SDATA "[dgr   ]"--=small delta, Greek-->
+<!ENTITY Dgr    SDATA "[Dgr   ]"--=capital Delta, Greek-->
+<!ENTITY egr    SDATA "[egr   ]"--=small epsilon, Greek-->
+<!ENTITY Egr    SDATA "[Egr   ]"--=capital Epsilon, Greek-->
+<!ENTITY zgr    SDATA "[zgr   ]"--=small zeta, Greek-->
+<!ENTITY Zgr    SDATA "[Zgr   ]"--=capital Zeta, Greek-->
+<!ENTITY eegr   SDATA "[eegr  ]"--=small eta, Greek-->
+<!ENTITY EEgr   SDATA "[EEgr  ]"--=capital Eta, Greek-->
+<!ENTITY thgr   SDATA "[thgr  ]"--=small theta, Greek-->
+<!ENTITY THgr   SDATA "[THgr  ]"--=capital Theta, Greek-->
+<!ENTITY igr    SDATA "[igr   ]"--=small iota, Greek-->
+<!ENTITY Igr    SDATA "[Igr   ]"--=capital Iota, Greek-->
+<!ENTITY kgr    SDATA "[kgr   ]"--=small kappa, Greek-->
+<!ENTITY Kgr    SDATA "[Kgr   ]"--=capital Kappa, Greek-->
+<!ENTITY lgr    SDATA "[lgr   ]"--=small lambda, Greek-->
+<!ENTITY Lgr    SDATA "[Lgr   ]"--=capital Lambda, Greek-->
+<!ENTITY mgr    SDATA "[mgr   ]"--=small mu, Greek-->
+<!ENTITY Mgr    SDATA "[Mgr   ]"--=capital Mu, Greek-->
+<!ENTITY ngr    SDATA "[ngr   ]"--=small nu, Greek-->
+<!ENTITY Ngr    SDATA "[Ngr   ]"--=capital Nu, Greek-->
+<!ENTITY xgr    SDATA "[xgr   ]"--=small xi, Greek-->
+<!ENTITY Xgr    SDATA "[Xgr   ]"--=capital Xi, Greek-->
+<!ENTITY ogr    SDATA "[ogr   ]"--=small omicron, Greek-->
+<!ENTITY Ogr    SDATA "[Ogr   ]"--=capital Omicron, Greek-->
+<!ENTITY pgr    SDATA "[pgr   ]"--=small pi, Greek-->
+<!ENTITY Pgr    SDATA "[Pgr   ]"--=capital Pi, Greek-->
+<!ENTITY rgr    SDATA "[rgr   ]"--=small rho, Greek-->
+<!ENTITY Rgr    SDATA "[Rgr   ]"--=capital Rho, Greek-->
+<!ENTITY sgr    SDATA "[sgr   ]"--=small sigma, Greek-->
+<!ENTITY Sgr    SDATA "[Sgr   ]"--=capital Sigma, Greek-->
+<!ENTITY sfgr   SDATA "[sfgr  ]"--=final small sigma, Greek-->
+<!ENTITY tgr    SDATA "[tgr   ]"--=small tau, Greek-->
+<!ENTITY Tgr    SDATA "[Tgr   ]"--=capital Tau, Greek-->
+<!ENTITY ugr    SDATA "[ugr   ]"--=small upsilon, Greek-->
+<!ENTITY Ugr    SDATA "[Ugr   ]"--=capital Upsilon, Greek-->
+<!ENTITY phgr   SDATA "[phgr  ]"--=small phi, Greek-->
+<!ENTITY PHgr   SDATA "[PHgr  ]"--=capital Phi, Greek-->
+<!ENTITY khgr   SDATA "[khgr  ]"--=small chi, Greek-->
+<!ENTITY KHgr   SDATA "[KHgr  ]"--=capital Chi, Greek-->
+<!ENTITY psgr   SDATA "[psgr  ]"--=small psi, Greek-->
+<!ENTITY PSgr   SDATA "[PSgr  ]"--=capital Psi, Greek-->
+<!ENTITY ohgr   SDATA "[ohgr  ]"--=small omega, Greek-->
+<!ENTITY OHgr   SDATA "[OHgr  ]"--=capital Omega, Greek-->
diff --git a/Doc/sgml/iso/ISOgrk2 b/Doc/sgml/iso/ISOgrk2
new file mode 100644
index 0000000..657bb99
--- /dev/null
+++ b/Doc/sgml/iso/ISOgrk2
@@ -0,0 +1,30 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOgrk2 PUBLIC
+       "ISO 8879:1986//ENTITIES Monotoniko Greek//EN">
+     %ISOgrk2;
+-->
+<!ENTITY aacgr  SDATA "[aacgr ]"--=small alpha, accent, Greek-->
+<!ENTITY Aacgr  SDATA "[Aacgr ]"--=capital Alpha, accent, Greek-->
+<!ENTITY eacgr  SDATA "[eacgr ]"--=small epsilon, accent, Greek-->
+<!ENTITY Eacgr  SDATA "[Eacgr ]"--=capital Epsilon, accent, Greek-->
+<!ENTITY eeacgr SDATA "[eeacgr]"--=small eta, accent, Greek-->
+<!ENTITY EEacgr SDATA "[EEacgr]"--=capital Eta, accent, Greek-->
+<!ENTITY idigr  SDATA "[idigr ]"--=small iota, dieresis, Greek-->
+<!ENTITY Idigr  SDATA "[Idigr ]"--=capital Iota, dieresis, Greek-->
+<!ENTITY iacgr  SDATA "[iacgr ]"--=small iota, accent, Greek-->
+<!ENTITY Iacgr  SDATA "[Iacgr ]"--=capital Iota, accent, Greek-->
+<!ENTITY idiagr SDATA "[idiagr]"--=small iota, dieresis, accent, Greek-->
+<!ENTITY oacgr  SDATA "[oacgr ]"--=small omicron, accent, Greek-->
+<!ENTITY Oacgr  SDATA "[Oacgr ]"--=capital Omicron, accent, Greek-->
+<!ENTITY udigr  SDATA "[udigr ]"--=small upsilon, dieresis, Greek-->
+<!ENTITY Udigr  SDATA "[Udigr ]"--=capital Upsilon, dieresis, Greek-->
+<!ENTITY uacgr  SDATA "[uacgr ]"--=small upsilon, accent, Greek-->
+<!ENTITY Uacgr  SDATA "[Uacgr ]"--=capital Upsilon, accent, Greek-->
+<!ENTITY udiagr SDATA "[udiagr]"--=small upsilon, dieresis, accent, Greek-->
+<!ENTITY ohacgr SDATA "[ohacgr]"--=small omega, accent, Greek-->
+<!ENTITY OHacgr SDATA "[OHacgr]"--=capital Omega, accent, Greek-->
diff --git a/Doc/sgml/iso/ISOgrk3 b/Doc/sgml/iso/ISOgrk3
new file mode 100644
index 0000000..f76c3a0
--- /dev/null
+++ b/Doc/sgml/iso/ISOgrk3
@@ -0,0 +1,53 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOgrk3 PUBLIC
+       "ISO 8879:1986//ENTITIES Greek Symbols//EN">
+     %ISOgrk3;
+-->
+<!ENTITY alpha    SDATA "[alpha ]"--=small alpha, Greek-->
+<!ENTITY beta     SDATA "[beta  ]"--=small beta, Greek-->
+<!ENTITY gamma    SDATA "[gamma ]"--=small gamma, Greek-->
+<!ENTITY Gamma    SDATA "[Gamma ]"--=capital Gamma, Greek-->
+<!ENTITY gammad   SDATA "[gammad]"--/digamma-->
+<!ENTITY delta    SDATA "[delta ]"--=small delta, Greek-->
+<!ENTITY Delta    SDATA "[Delta ]"--=capital Delta, Greek-->
+<!ENTITY epsi     SDATA "[epsi  ]"--=small epsilon, Greek-->
+<!ENTITY epsiv    SDATA "[epsiv ]"--/varepsilon-->
+<!ENTITY epsis    SDATA "[epsis ]"--/straightepsilon-->
+<!ENTITY zeta     SDATA "[zeta  ]"--=small zeta, Greek-->
+<!ENTITY eta      SDATA "[eta   ]"--=small eta, Greek-->
+<!ENTITY thetas   SDATA "[thetas]"--straight theta-->
+<!ENTITY Theta    SDATA "[Theta ]"--=capital Theta, Greek-->
+<!ENTITY thetav   SDATA "[thetav]"--/vartheta - curly or open theta-->
+<!ENTITY iota     SDATA "[iota  ]"--=small iota, Greek-->
+<!ENTITY kappa    SDATA "[kappa ]"--=small kappa, Greek-->
+<!ENTITY kappav   SDATA "[kappav]"--/varkappa-->
+<!ENTITY lambda   SDATA "[lambda]"--=small lambda, Greek-->
+<!ENTITY Lambda   SDATA "[Lambda]"--=capital Lambda, Greek-->
+<!ENTITY mu       SDATA "[mu    ]"--=small mu, Greek-->
+<!ENTITY nu       SDATA "[nu    ]"--=small nu, Greek-->
+<!ENTITY xi       SDATA "[xi    ]"--=small xi, Greek-->
+<!ENTITY Xi       SDATA "[Xi    ]"--=capital Xi, Greek-->
+<!ENTITY pi       SDATA "[pi    ]"--=small pi, Greek-->
+<!ENTITY piv      SDATA "[piv   ]"--/varpi-->
+<!ENTITY Pi       SDATA "[Pi    ]"--=capital Pi, Greek-->
+<!ENTITY rho      SDATA "[rho   ]"--=small rho, Greek-->
+<!ENTITY rhov     SDATA "[rhov  ]"--/varrho-->
+<!ENTITY sigma    SDATA "[sigma ]"--=small sigma, Greek-->
+<!ENTITY Sigma    SDATA "[Sigma ]"--=capital Sigma, Greek-->
+<!ENTITY sigmav   SDATA "[sigmav]"--/varsigma-->
+<!ENTITY tau      SDATA "[tau   ]"--=small tau, Greek-->
+<!ENTITY upsi     SDATA "[upsi  ]"--=small upsilon, Greek-->
+<!ENTITY Upsi     SDATA "[Upsi  ]"--=capital Upsilon, Greek-->
+<!ENTITY phis     SDATA "[phis  ]"--/straightphi - straight phi-->
+<!ENTITY Phi      SDATA "[Phi   ]"--=capital Phi, Greek-->
+<!ENTITY phiv     SDATA "[phiv  ]"--/varphi - curly or open phi-->
+<!ENTITY chi      SDATA "[chi   ]"--=small chi, Greek-->
+<!ENTITY psi      SDATA "[psi   ]"--=small psi, Greek-->
+<!ENTITY Psi      SDATA "[Psi   ]"--=capital Psi, Greek-->
+<!ENTITY omega    SDATA "[omega ]"--=small omega, Greek-->
+<!ENTITY Omega    SDATA "[Omega ]"--=capital Omega, Greek-->
diff --git a/Doc/sgml/iso/ISOgrk4 b/Doc/sgml/iso/ISOgrk4
new file mode 100644
index 0000000..e4427a0
--- /dev/null
+++ b/Doc/sgml/iso/ISOgrk4
@@ -0,0 +1,53 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOgrk4 PUBLIC
+       "ISO 8879:1986//ENTITIES Alternative Greek Symbols//EN">
+     %ISOgrk4;
+-->
+<!ENTITY b.alpha  SDATA "[b.alpha ]"--=small alpha, Greek-->
+<!ENTITY b.beta   SDATA "[b.beta  ]"--=small beta, Greek-->
+<!ENTITY b.gamma  SDATA "[b.gamma ]"--=small gamma, Greek-->
+<!ENTITY b.Gamma  SDATA "[b.Gamma ]"--=capital Gamma, Greek-->
+<!ENTITY b.gammad SDATA "[b.gammad]"--/digamma-->
+<!ENTITY b.delta  SDATA "[b.delta ]"--=small delta, Greek-->
+<!ENTITY b.Delta  SDATA "[b.Delta ]"--=capital Delta, Greek-->
+<!ENTITY b.epsi   SDATA "[b.epsi  ]"--=small epsilon, Greek-->
+<!ENTITY b.epsiv  SDATA "[b.epsiv ]"--/varepsilon-->
+<!ENTITY b.epsis  SDATA "[b.epsis ]"--/straightepsilon-->
+<!ENTITY b.zeta   SDATA "[b.zeta  ]"--=small zeta, Greek-->
+<!ENTITY b.eta    SDATA "[b.eta   ]"--=small eta, Greek-->
+<!ENTITY b.thetas SDATA "[b.thetas]"--straight theta-->
+<!ENTITY b.Theta  SDATA "[b.Theta ]"--=capital Theta, Greek-->
+<!ENTITY b.thetav SDATA "[b.thetav]"--/vartheta - curly or open theta-->
+<!ENTITY b.iota   SDATA "[b.iota  ]"--=small iota, Greek-->
+<!ENTITY b.kappa  SDATA "[b.kappa ]"--=small kappa, Greek-->
+<!ENTITY b.kappav SDATA "[b.kappav]"--/varkappa-->
+<!ENTITY b.lambda SDATA "[b.lambda]"--=small lambda, Greek-->
+<!ENTITY b.Lambda SDATA "[b.Lambda]"--=capital Lambda, Greek-->
+<!ENTITY b.mu     SDATA "[b.mu    ]"--=small mu, Greek-->
+<!ENTITY b.nu     SDATA "[b.nu    ]"--=small nu, Greek-->
+<!ENTITY b.xi     SDATA "[b.xi    ]"--=small xi, Greek-->
+<!ENTITY b.Xi     SDATA "[b.Xi    ]"--=capital Xi, Greek-->
+<!ENTITY b.pi     SDATA "[b.pi    ]"--=small pi, Greek-->
+<!ENTITY b.Pi     SDATA "[b.Pi    ]"--=capital Pi, Greek-->
+<!ENTITY b.piv    SDATA "[b.piv   ]"--/varpi-->
+<!ENTITY b.rho    SDATA "[b.rho   ]"--=small rho, Greek-->
+<!ENTITY b.rhov   SDATA "[b.rhov  ]"--/varrho-->
+<!ENTITY b.sigma  SDATA "[b.sigma ]"--=small sigma, Greek-->
+<!ENTITY b.Sigma  SDATA "[b.Sigma ]"--=capital Sigma, Greek-->
+<!ENTITY b.sigmav SDATA "[b.sigmav]"--/varsigma-->
+<!ENTITY b.tau    SDATA "[b.tau   ]"--=small tau, Greek-->
+<!ENTITY b.upsi   SDATA "[b.upsi  ]"--=small upsilon, Greek-->
+<!ENTITY b.Upsi   SDATA "[b.Upsi  ]"--=capital Upsilon, Greek-->
+<!ENTITY b.phis   SDATA "[b.phis  ]"--/straightphi - straight phi-->
+<!ENTITY b.Phi    SDATA "[b.Phi   ]"--=capital Phi, Greek-->
+<!ENTITY b.phiv   SDATA "[b.phiv  ]"--/varphi - curly or open phi-->
+<!ENTITY b.chi    SDATA "[b.chi   ]"--=small chi, Greek-->
+<!ENTITY b.psi    SDATA "[b.psi   ]"--=small psi, Greek-->
+<!ENTITY b.Psi    SDATA "[b.Psi   ]"--=capital Psi, Greek-->
+<!ENTITY b.omega  SDATA "[b.omega ]"--=small omega, Greek-->
+<!ENTITY b.Omega  SDATA "[b.Omega ]"--=capital Omega, Greek-->
diff --git a/Doc/sgml/iso/ISOlat1 b/Doc/sgml/iso/ISOlat1
new file mode 100644
index 0000000..0d7d0a7
--- /dev/null
+++ b/Doc/sgml/iso/ISOlat1
@@ -0,0 +1,72 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOlat1 PUBLIC
+       "ISO 8879:1986//ENTITIES Added Latin 1//EN">
+     %ISOlat1;
+-->
+<!ENTITY aacute SDATA "[aacute]"--=small a, acute accent-->
+<!ENTITY Aacute SDATA "[Aacute]"--=capital A, acute accent-->
+<!ENTITY acirc  SDATA "[acirc ]"--=small a, circumflex accent-->
+<!ENTITY Acirc  SDATA "[Acirc ]"--=capital A, circumflex accent-->
+<!ENTITY agrave SDATA "[agrave]"--=small a, grave accent-->
+<!ENTITY Agrave SDATA "[Agrave]"--=capital A, grave accent-->
+<!ENTITY aring  SDATA "[aring ]"--=small a, ring-->
+<!ENTITY Aring  SDATA "[Aring ]"--=capital A, ring-->
+<!ENTITY atilde SDATA "[atilde]"--=small a, tilde-->
+<!ENTITY Atilde SDATA "[Atilde]"--=capital A, tilde-->
+<!ENTITY auml   SDATA "[auml  ]"--=small a, dieresis or umlaut mark-->
+<!ENTITY Auml   SDATA "[Auml  ]"--=capital A, dieresis or umlaut mark-->
+<!ENTITY aelig  SDATA "[aelig ]"--=small ae diphthong (ligature)-->
+<!ENTITY AElig  SDATA "[AElig ]"--=capital AE diphthong (ligature)-->
+<!ENTITY ccedil SDATA "[ccedil]"--=small c, cedilla-->
+<!ENTITY Ccedil SDATA "[Ccedil]"--=capital C, cedilla-->
+<!ENTITY eth    SDATA "[eth   ]"--=small eth, Icelandic-->
+<!ENTITY ETH    SDATA "[ETH   ]"--=capital Eth, Icelandic-->
+<!ENTITY eacute SDATA "[eacute]"--=small e, acute accent-->
+<!ENTITY Eacute SDATA "[Eacute]"--=capital E, acute accent-->
+<!ENTITY ecirc  SDATA "[ecirc ]"--=small e, circumflex accent-->
+<!ENTITY Ecirc  SDATA "[Ecirc ]"--=capital E, circumflex accent-->
+<!ENTITY egrave SDATA "[egrave]"--=small e, grave accent-->
+<!ENTITY Egrave SDATA "[Egrave]"--=capital E, grave accent-->
+<!ENTITY euml   SDATA "[euml  ]"--=small e, dieresis or umlaut mark-->
+<!ENTITY Euml   SDATA "[Euml  ]"--=capital E, dieresis or umlaut mark-->
+<!ENTITY iacute SDATA "[iacute]"--=small i, acute accent-->
+<!ENTITY Iacute SDATA "[Iacute]"--=capital I, acute accent-->
+<!ENTITY icirc  SDATA "[icirc ]"--=small i, circumflex accent-->
+<!ENTITY Icirc  SDATA "[Icirc ]"--=capital I, circumflex accent-->
+<!ENTITY igrave SDATA "[igrave]"--=small i, grave accent-->
+<!ENTITY Igrave SDATA "[Igrave]"--=capital I, grave accent-->
+<!ENTITY iuml   SDATA "[iuml  ]"--=small i, dieresis or umlaut mark-->
+<!ENTITY Iuml   SDATA "[Iuml  ]"--=capital I, dieresis or umlaut mark-->
+<!ENTITY ntilde SDATA "[ntilde]"--=small n, tilde-->
+<!ENTITY Ntilde SDATA "[Ntilde]"--=capital N, tilde-->
+<!ENTITY oacute SDATA "[oacute]"--=small o, acute accent-->
+<!ENTITY Oacute SDATA "[Oacute]"--=capital O, acute accent-->
+<!ENTITY ocirc  SDATA "[ocirc ]"--=small o, circumflex accent-->
+<!ENTITY Ocirc  SDATA "[Ocirc ]"--=capital O, circumflex accent-->
+<!ENTITY ograve SDATA "[ograve]"--=small o, grave accent-->
+<!ENTITY Ograve SDATA "[Ograve]"--=capital O, grave accent-->
+<!ENTITY oslash SDATA "[oslash]"--=small o, slash-->
+<!ENTITY Oslash SDATA "[Oslash]"--=capital O, slash-->
+<!ENTITY otilde SDATA "[otilde]"--=small o, tilde-->
+<!ENTITY Otilde SDATA "[Otilde]"--=capital O, tilde-->
+<!ENTITY ouml   SDATA "[ouml  ]"--=small o, dieresis or umlaut mark-->
+<!ENTITY Ouml   SDATA "[Ouml  ]"--=capital O, dieresis or umlaut mark-->
+<!ENTITY szlig  SDATA "[szlig ]"--=small sharp s, German (sz ligature)-->
+<!ENTITY thorn  SDATA "[thorn ]"--=small thorn, Icelandic-->
+<!ENTITY THORN  SDATA "[THORN ]"--=capital THORN, Icelandic-->
+<!ENTITY uacute SDATA "[uacute]"--=small u, acute accent-->
+<!ENTITY Uacute SDATA "[Uacute]"--=capital U, acute accent-->
+<!ENTITY ucirc  SDATA "[ucirc ]"--=small u, circumflex accent-->
+<!ENTITY Ucirc  SDATA "[Ucirc ]"--=capital U, circumflex accent-->
+<!ENTITY ugrave SDATA "[ugrave]"--=small u, grave accent-->
+<!ENTITY Ugrave SDATA "[Ugrave]"--=capital U, grave accent-->
+<!ENTITY uuml   SDATA "[uuml  ]"--=small u, dieresis or umlaut mark-->
+<!ENTITY Uuml   SDATA "[Uuml  ]"--=capital U, dieresis or umlaut mark-->
+<!ENTITY yacute SDATA "[yacute]"--=small y, acute accent-->
+<!ENTITY Yacute SDATA "[Yacute]"--=capital Y, acute accent-->
+<!ENTITY yuml   SDATA "[yuml  ]"--=small y, dieresis or umlaut mark-->
diff --git a/Doc/sgml/iso/ISOlat2 b/Doc/sgml/iso/ISOlat2
new file mode 100644
index 0000000..4bcb337
--- /dev/null
+++ b/Doc/sgml/iso/ISOlat2
@@ -0,0 +1,131 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOlat2 PUBLIC
+       "ISO 8879:1986//ENTITIES Added Latin 2//EN">
+     %ISOlat2;
+-->
+<!ENTITY abreve SDATA "[abreve]"--=small a, breve-->
+<!ENTITY Abreve SDATA "[Abreve]"--=capital A, breve-->
+<!ENTITY amacr  SDATA "[amacr ]"--=small a, macron-->
+<!ENTITY Amacr  SDATA "[Amacr ]"--=capital A, macron-->
+<!ENTITY aogon  SDATA "[aogon ]"--=small a, ogonek-->
+<!ENTITY Aogon  SDATA "[Aogon ]"--=capital A, ogonek-->
+<!ENTITY cacute SDATA "[cacute]"--=small c, acute accent-->
+<!ENTITY Cacute SDATA "[Cacute]"--=capital C, acute accent-->
+<!ENTITY ccaron SDATA "[ccaron]"--=small c, caron-->
+<!ENTITY Ccaron SDATA "[Ccaron]"--=capital C, caron-->
+<!ENTITY ccirc  SDATA "[ccirc ]"--=small c, circumflex accent-->
+<!ENTITY Ccirc  SDATA "[Ccirc ]"--=capital C, circumflex accent-->
+<!ENTITY cdot   SDATA "[cdot  ]"--=small c, dot above-->
+<!ENTITY Cdot   SDATA "[Cdot  ]"--=capital C, dot above-->
+<!ENTITY dcaron SDATA "[dcaron]"--=small d, caron-->
+<!ENTITY Dcaron SDATA "[Dcaron]"--=capital D, caron-->
+<!ENTITY dstrok SDATA "[dstrok]"--=small d, stroke-->
+<!ENTITY Dstrok SDATA "[Dstrok]"--=capital D, stroke-->
+<!ENTITY ecaron SDATA "[ecaron]"--=small e, caron-->
+<!ENTITY Ecaron SDATA "[Ecaron]"--=capital E, caron-->
+<!ENTITY edot   SDATA "[edot  ]"--=small e, dot above-->
+<!ENTITY Edot   SDATA "[Edot  ]"--=capital E, dot above-->
+<!ENTITY emacr  SDATA "[emacr ]"--=small e, macron-->
+<!ENTITY Emacr  SDATA "[Emacr ]"--=capital E, macron-->
+<!ENTITY eogon  SDATA "[eogon ]"--=small e, ogonek-->
+<!ENTITY Eogon  SDATA "[Eogon ]"--=capital E, ogonek-->
+<!ENTITY gacute SDATA "[gacute]"--=small g, acute accent-->
+<!ENTITY gbreve SDATA "[gbreve]"--=small g, breve-->
+<!ENTITY Gbreve SDATA "[Gbreve]"--=capital G, breve-->
+<!ENTITY Gcedil SDATA "[Gcedil]"--=capital G, cedilla-->
+<!ENTITY gcirc  SDATA "[gcirc ]"--=small g, circumflex accent-->
+<!ENTITY Gcirc  SDATA "[Gcirc ]"--=capital G, circumflex accent-->
+<!ENTITY gdot   SDATA "[gdot  ]"--=small g, dot above-->
+<!ENTITY Gdot   SDATA "[Gdot  ]"--=capital G, dot above-->
+<!ENTITY hcirc  SDATA "[hcirc ]"--=small h, circumflex accent-->
+<!ENTITY Hcirc  SDATA "[Hcirc ]"--=capital H, circumflex accent-->
+<!ENTITY hstrok SDATA "[hstrok]"--=small h, stroke-->
+<!ENTITY Hstrok SDATA "[Hstrok]"--=capital H, stroke-->
+<!ENTITY Idot   SDATA "[Idot  ]"--=capital I, dot above-->
+<!ENTITY Imacr  SDATA "[Imacr ]"--=capital I, macron-->
+<!ENTITY imacr  SDATA "[imacr ]"--=small i, macron-->
+<!ENTITY ijlig  SDATA "[ijlig ]"--=small ij ligature-->
+<!ENTITY IJlig  SDATA "[IJlig ]"--=capital IJ ligature-->
+<!ENTITY inodot SDATA "[inodot]"--=small i without dot-->
+<!ENTITY iogon  SDATA "[iogon ]"--=small i, ogonek-->
+<!ENTITY Iogon  SDATA "[Iogon ]"--=capital I, ogonek-->
+<!ENTITY itilde SDATA "[itilde]"--=small i, tilde-->
+<!ENTITY Itilde SDATA "[Itilde]"--=capital I, tilde-->
+<!ENTITY jcirc  SDATA "[jcirc ]"--=small j, circumflex accent-->
+<!ENTITY Jcirc  SDATA "[Jcirc ]"--=capital J, circumflex accent-->
+<!ENTITY kcedil SDATA "[kcedil]"--=small k, cedilla-->
+<!ENTITY Kcedil SDATA "[Kcedil]"--=capital K, cedilla-->
+<!ENTITY kgreen SDATA "[kgreen]"--=small k, Greenlandic-->
+<!ENTITY lacute SDATA "[lacute]"--=small l, acute accent-->
+<!ENTITY Lacute SDATA "[Lacute]"--=capital L, acute accent-->
+<!ENTITY lcaron SDATA "[lcaron]"--=small l, caron-->
+<!ENTITY Lcaron SDATA "[Lcaron]"--=capital L, caron-->
+<!ENTITY lcedil SDATA "[lcedil]"--=small l, cedilla-->
+<!ENTITY Lcedil SDATA "[Lcedil]"--=capital L, cedilla-->
+<!ENTITY lmidot SDATA "[lmidot]"--=small l, middle dot-->
+<!ENTITY Lmidot SDATA "[Lmidot]"--=capital L, middle dot-->
+<!ENTITY lstrok SDATA "[lstrok]"--=small l, stroke-->
+<!ENTITY Lstrok SDATA "[Lstrok]"--=capital L, stroke-->
+<!ENTITY nacute SDATA "[nacute]"--=small n, acute accent-->
+<!ENTITY Nacute SDATA "[Nacute]"--=capital N, acute accent-->
+<!ENTITY eng    SDATA "[eng   ]"--=small eng, Lapp-->
+<!ENTITY ENG    SDATA "[ENG   ]"--=capital ENG, Lapp-->
+<!ENTITY napos  SDATA "[napos ]"--=small n, apostrophe-->
+<!ENTITY ncaron SDATA "[ncaron]"--=small n, caron-->
+<!ENTITY Ncaron SDATA "[Ncaron]"--=capital N, caron-->
+<!ENTITY ncedil SDATA "[ncedil]"--=small n, cedilla-->
+<!ENTITY Ncedil SDATA "[Ncedil]"--=capital N, cedilla-->
+<!ENTITY odblac SDATA "[odblac]"--=small o, double acute accent-->
+<!ENTITY Odblac SDATA "[Odblac]"--=capital O, double acute accent-->
+<!ENTITY Omacr  SDATA "[Omacr ]"--=capital O, macron-->
+<!ENTITY omacr  SDATA "[omacr ]"--=small o, macron-->
+<!ENTITY oelig  SDATA "[oelig ]"--=small oe ligature-->
+<!ENTITY OElig  SDATA "[OElig ]"--=capital OE ligature-->
+<!ENTITY racute SDATA "[racute]"--=small r, acute accent-->
+<!ENTITY Racute SDATA "[Racute]"--=capital R, acute accent-->
+<!ENTITY rcaron SDATA "[rcaron]"--=small r, caron-->
+<!ENTITY Rcaron SDATA "[Rcaron]"--=capital R, caron-->
+<!ENTITY rcedil SDATA "[rcedil]"--=small r, cedilla-->
+<!ENTITY Rcedil SDATA "[Rcedil]"--=capital R, cedilla-->
+<!ENTITY sacute SDATA "[sacute]"--=small s, acute accent-->
+<!ENTITY Sacute SDATA "[Sacute]"--=capital S, acute accent-->
+<!ENTITY scaron SDATA "[scaron]"--=small s, caron-->
+<!ENTITY Scaron SDATA "[Scaron]"--=capital S, caron-->
+<!ENTITY scedil SDATA "[scedil]"--=small s, cedilla-->
+<!ENTITY Scedil SDATA "[Scedil]"--=capital S, cedilla-->
+<!ENTITY scirc  SDATA "[scirc ]"--=small s, circumflex accent-->
+<!ENTITY Scirc  SDATA "[Scirc ]"--=capital S, circumflex accent-->
+<!ENTITY tcaron SDATA "[tcaron]"--=small t, caron-->
+<!ENTITY Tcaron SDATA "[Tcaron]"--=capital T, caron-->
+<!ENTITY tcedil SDATA "[tcedil]"--=small t, cedilla-->
+<!ENTITY Tcedil SDATA "[Tcedil]"--=capital T, cedilla-->
+<!ENTITY tstrok SDATA "[tstrok]"--=small t, stroke-->
+<!ENTITY Tstrok SDATA "[Tstrok]"--=capital T, stroke-->
+<!ENTITY ubreve SDATA "[ubreve]"--=small u, breve-->
+<!ENTITY Ubreve SDATA "[Ubreve]"--=capital U, breve-->
+<!ENTITY udblac SDATA "[udblac]"--=small u, double acute accent-->
+<!ENTITY Udblac SDATA "[Udblac]"--=capital U, double acute accent-->
+<!ENTITY umacr  SDATA "[umacr ]"--=small u, macron-->
+<!ENTITY Umacr  SDATA "[Umacr ]"--=capital U, macron-->
+<!ENTITY uogon  SDATA "[uogon ]"--=small u, ogonek-->
+<!ENTITY Uogon  SDATA "[Uogon ]"--=capital U, ogonek-->
+<!ENTITY uring  SDATA "[uring ]"--=small u, ring-->
+<!ENTITY Uring  SDATA "[Uring ]"--=capital U, ring-->
+<!ENTITY utilde SDATA "[utilde]"--=small u, tilde-->
+<!ENTITY Utilde SDATA "[Utilde]"--=capital U, tilde-->
+<!ENTITY wcirc  SDATA "[wcirc ]"--=small w, circumflex accent-->
+<!ENTITY Wcirc  SDATA "[Wcirc ]"--=capital W, circumflex accent-->
+<!ENTITY ycirc  SDATA "[ycirc ]"--=small y, circumflex accent-->
+<!ENTITY Ycirc  SDATA "[Ycirc ]"--=capital Y, circumflex accent-->
+<!ENTITY Yuml   SDATA "[Yuml  ]"--=capital Y, dieresis or umlaut mark-->
+<!ENTITY zacute SDATA "[zacute]"--=small z, acute accent-->
+<!ENTITY Zacute SDATA "[Zacute]"--=capital Z, acute accent-->
+<!ENTITY zcaron SDATA "[zcaron]"--=small z, caron-->
+<!ENTITY Zcaron SDATA "[Zcaron]"--=capital Z, caron-->
+<!ENTITY zdot   SDATA "[zdot  ]"--=small z, dot above-->
+<!ENTITY Zdot   SDATA "[Zdot  ]"--=capital Z, dot above-->
diff --git a/Doc/sgml/iso/ISOnum b/Doc/sgml/iso/ISOnum
new file mode 100644
index 0000000..d7b41c3
--- /dev/null
+++ b/Doc/sgml/iso/ISOnum
@@ -0,0 +1,91 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOnum PUBLIC
+       "ISO 8879:1986//ENTITIES Numeric and Special Graphic//EN">
+     %ISOnum;
+-->
+<!ENTITY half   SDATA "[half  ]"--=fraction one-half-->
+<!ENTITY frac12 SDATA "[frac12]"--=fraction one-half-->
+<!ENTITY frac14 SDATA "[frac14]"--=fraction one-quarter-->
+<!ENTITY frac34 SDATA "[frac34]"--=fraction three-quarters-->
+<!ENTITY frac18 SDATA "[frac18]"--=fraction one-eighth-->
+<!ENTITY frac38 SDATA "[frac38]"--=fraction three-eighths-->
+<!ENTITY frac58 SDATA "[frac58]"--=fraction five-eighths-->
+<!ENTITY frac78 SDATA "[frac78]"--=fraction seven-eighths-->
+
+<!ENTITY sup1   SDATA "[sup1  ]"--=superscript one-->
+<!ENTITY sup2   SDATA "[sup2  ]"--=superscript two-->
+<!ENTITY sup3   SDATA "[sup3  ]"--=superscript three-->
+
+<!ENTITY plus   SDATA "[plus  ]"--=plus sign B:-- >
+<!ENTITY plusmn SDATA "[plusmn]"--/pm B: =plus-or-minus sign-->
+<!ENTITY lt     SDATA "[lt    ]"--=less-than sign R:-->
+<!ENTITY equals SDATA "[equals]"--=equals sign R:-->
+<!ENTITY gt     SDATA "[gt    ]"--=greater-than sign R:-->
+<!ENTITY divide SDATA "[divide]"--/div B: =divide sign-->
+<!ENTITY times  SDATA "[times ]"--/times B: =multiply sign-->
+
+<!ENTITY curren SDATA "[curren]"--=general currency sign-->
+<!ENTITY pound  SDATA "[pound ]"--=pound sign-->
+<!ENTITY dollar SDATA "[dollar]"--=dollar sign-->
+<!ENTITY cent   SDATA "[cent  ]"--=cent sign-->
+<!ENTITY yen    SDATA "[yen   ]"--/yen =yen sign-->
+
+<!ENTITY num    SDATA "[num   ]"--=number sign-->
+<!ENTITY percnt SDATA "[percnt]"--=percent sign-->
+<!ENTITY amp    SDATA "[amp   ]"--=ampersand-->
+<!ENTITY ast    SDATA "[ast   ]"--/ast B: =asterisk-->
+<!ENTITY commat SDATA "[commat]"--=commercial at-->
+<!ENTITY lsqb   SDATA "[lsqb  ]"--/lbrack O: =left square bracket-->
+<!ENTITY bsol   SDATA "[bsol  ]"--/backslash =reverse solidus-->
+<!ENTITY rsqb   SDATA "[rsqb  ]"--/rbrack C: =right square bracket-->
+<!ENTITY lcub   SDATA "[lcub  ]"--/lbrace O: =left curly bracket-->
+<!ENTITY horbar SDATA "[horbar]"--=horizontal bar-->
+<!ENTITY verbar SDATA "[verbar]"--/vert =vertical bar-->
+<!ENTITY rcub   SDATA "[rcub  ]"--/rbrace C: =right curly bracket-->
+<!ENTITY micro  SDATA "[micro ]"--=micro sign-->
+<!ENTITY ohm    SDATA "[ohm   ]"--=ohm sign-->
+<!ENTITY deg    SDATA "[deg   ]"--=degree sign-->
+<!ENTITY ordm   SDATA "[ordm  ]"--=ordinal indicator, masculine-->
+<!ENTITY ordf   SDATA "[ordf  ]"--=ordinal indicator, feminine-->
+<!ENTITY sect   SDATA "[sect  ]"--=section sign-->
+<!ENTITY para   SDATA "[para  ]"--=pilcrow (paragraph sign)-->
+<!ENTITY middot SDATA "[middot]"--/centerdot B: =middle dot-->
+<!ENTITY larr   SDATA "[larr  ]"--/leftarrow /gets A: =leftward arrow-->
+<!ENTITY rarr   SDATA "[rarr  ]"--/rightarrow /to A: =rightward arrow-->
+<!ENTITY uarr   SDATA "[uarr  ]"--/uparrow A: =upward arrow-->
+<!ENTITY darr   SDATA "[darr  ]"--/downarrow A: =downward arrow-->
+<!ENTITY copy   SDATA "[copy  ]"--=copyright sign-->
+<!ENTITY reg    SDATA "[reg   ]"--/circledR =registered sign-->
+<!ENTITY trade  SDATA "[trade ]"--=trade mark sign-->
+<!ENTITY brvbar SDATA "[brvbar]"--=broken (vertical) bar-->
+<!ENTITY not    SDATA "[not   ]"--/neg /lnot =not sign-->
+<!ENTITY sung   SDATA "[sung  ]"--=music note (sung text sign)-->
+
+<!ENTITY excl   SDATA "[excl  ]"--=exclamation mark-->
+<!ENTITY iexcl  SDATA "[iexcl ]"--=inverted exclamation mark-->
+<!ENTITY quot   SDATA "[quot  ]"--=quotation mark-->
+<!ENTITY apos   SDATA "[apos  ]"--=apostrophe-->
+<!ENTITY lpar   SDATA "[lpar  ]"--O: =left parenthesis-->
+<!ENTITY rpar   SDATA "[rpar  ]"--C: =right parenthesis-->
+<!ENTITY comma  SDATA "[comma ]"--P: =comma-->
+<!ENTITY lowbar SDATA "[lowbar]"--=low line-->
+<!ENTITY hyphen SDATA "[hyphen]"--=hyphen-->
+<!ENTITY period SDATA "[period]"--=full stop, period-->
+<!ENTITY sol    SDATA "[sol   ]"--=solidus-->
+<!ENTITY colon  SDATA "[colon ]"--/colon P:-->
+<!ENTITY semi   SDATA "[semi  ]"--=semicolon P:-->
+<!ENTITY quest  SDATA "[quest ]"--=question mark-->
+<!ENTITY iquest SDATA "[iquest]"--=inverted question mark-->
+<!ENTITY laquo  SDATA "[laquo ]"--=angle quotation mark, left-->
+<!ENTITY raquo  SDATA "[raquo ]"--=angle quotation mark, right-->
+<!ENTITY lsquo  SDATA "[lsquo ]"--=single quotation mark, left-->
+<!ENTITY rsquo  SDATA "[rsquo ]"--=single quotation mark, right-->
+<!ENTITY ldquo  SDATA "[ldquo ]"--=double quotation mark, left-->
+<!ENTITY rdquo  SDATA "[rdquo ]"--=double quotation mark, right-->
+<!ENTITY nbsp   SDATA "[nbsp  ]"--=no break (required) space-->
+<!ENTITY shy    SDATA "[shy   ]"--=soft hyphen-->
diff --git a/Doc/sgml/iso/ISOpub b/Doc/sgml/iso/ISOpub
new file mode 100644
index 0000000..c184973
--- /dev/null
+++ b/Doc/sgml/iso/ISOpub
@@ -0,0 +1,100 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOpub PUBLIC
+       "ISO 8879:1986//ENTITIES Publishing//EN">
+     %ISOpub;
+-->
+<!ENTITY emsp   SDATA "[emsp  ]"--=em space-->
+<!ENTITY ensp   SDATA "[ensp  ]"--=en space (1/2-em)-->
+<!ENTITY emsp13 SDATA "[emsp3 ]"--=1/3-em space-->
+<!ENTITY emsp14 SDATA "[emsp4 ]"--=1/4-em space-->
+<!ENTITY numsp  SDATA "[numsp ]"--=digit space (width of a number)-->
+<!ENTITY puncsp SDATA "[puncsp]"--=punctuation space (width of comma)-->
+<!ENTITY thinsp SDATA "[thinsp]"--=thin space (1/6-em)-->
+<!ENTITY hairsp SDATA "[hairsp]"--=hair space-->
+<!ENTITY mdash  SDATA "[mdash ]"--=em dash-->
+<!ENTITY ndash  SDATA "[ndash ]"--=en dash-->
+<!ENTITY dash   SDATA "[dash  ]"--=hyphen (true graphic)-->
+<!ENTITY blank  SDATA "[blank ]"--=significant blank symbol-->
+<!ENTITY hellip SDATA "[hellip]"--=ellipsis (horizontal)-->
+<!ENTITY nldr   SDATA "[nldr  ]"--=double baseline dot (en leader)-->
+<!ENTITY frac13 SDATA "[frac13]"--=fraction one-third-->
+<!ENTITY frac23 SDATA "[frac23]"--=fraction two-thirds-->
+<!ENTITY frac15 SDATA "[frac15]"--=fraction one-fifth-->
+<!ENTITY frac25 SDATA "[frac25]"--=fraction two-fifths-->
+<!ENTITY frac35 SDATA "[frac35]"--=fraction three-fifths-->
+<!ENTITY frac45 SDATA "[frac45]"--=fraction four-fifths-->
+<!ENTITY frac16 SDATA "[frac16]"--=fraction one-sixth-->
+<!ENTITY frac56 SDATA "[frac56]"--=fraction five-sixths-->
+<!ENTITY incare SDATA "[incare]"--=in-care-of symbol-->
+<!ENTITY block  SDATA "[block ]"--=full block-->
+<!ENTITY uhblk  SDATA "[uhblk ]"--=upper half block-->
+<!ENTITY lhblk  SDATA "[lhblk ]"--=lower half block-->
+<!ENTITY blk14  SDATA "[blk14 ]"--=25% shaded block-->
+<!ENTITY blk12  SDATA "[blk12 ]"--=50% shaded block-->
+<!ENTITY blk34  SDATA "[blk34 ]"--=75% shaded block-->
+<!ENTITY marker SDATA "[marker]"--=histogram marker-->
+<!ENTITY cir    SDATA "[cir   ]"--/circ B: =circle, open-->
+<!ENTITY squ    SDATA "[squ   ]"--=square, open-->
+<!ENTITY rect   SDATA "[rect  ]"--=rectangle, open-->
+<!ENTITY utri   SDATA "[utri  ]"--/triangle =up triangle, open-->
+<!ENTITY dtri   SDATA "[dtri  ]"--/triangledown =down triangle, open-->
+<!ENTITY star   SDATA "[star  ]"--=star, open-->
+<!ENTITY bull   SDATA "[bull  ]"--/bullet B: =round bullet, filled-->
+<!ENTITY squf   SDATA "[squf  ]"--/blacksquare =sq bullet, filled-->
+<!ENTITY utrif  SDATA "[utrif ]"--/blacktriangle =up tri, filled-->
+<!ENTITY dtrif  SDATA "[dtrif ]"--/blacktriangledown =dn tri, filled-->
+<!ENTITY ltrif  SDATA "[ltrif ]"--/blacktriangleleft R: =l tri, filled-->
+<!ENTITY rtrif  SDATA "[rtrif ]"--/blacktriangleright R: =r tri, filled-->
+<!ENTITY clubs  SDATA "[clubs ]"--/clubsuit =club suit symbol-->
+<!ENTITY diams  SDATA "[diams ]"--/diamondsuit =diamond suit symbol-->
+<!ENTITY hearts SDATA "[hearts]"--/heartsuit =heart suit symbol-->
+<!ENTITY spades SDATA "[spades]"--/spadesuit =spades suit symbol-->
+<!ENTITY malt   SDATA "[malt  ]"--/maltese =maltese cross-->
+<!ENTITY dagger SDATA "[dagger]"--/dagger B: =dagger-->
+<!ENTITY Dagger SDATA "[Dagger]"--/ddagger B: =double dagger-->
+<!ENTITY check  SDATA "[check ]"--/checkmark =tick, check mark-->
+<!ENTITY cross  SDATA "[ballot]"--=ballot cross-->
+<!ENTITY sharp  SDATA "[sharp ]"--/sharp =musical sharp-->
+<!ENTITY flat   SDATA "[flat  ]"--/flat =musical flat-->
+<!ENTITY male   SDATA "[male  ]"--=male symbol-->
+<!ENTITY female SDATA "[female]"--=female symbol-->
+<!ENTITY phone  SDATA "[phone ]"--=telephone symbol-->
+<!ENTITY telrec SDATA "[telrec]"--=telephone recorder symbol-->
+<!ENTITY copysr SDATA "[copysr]"--=sound recording copyright sign-->
+<!ENTITY caret  SDATA "[caret ]"--=caret (insertion mark)-->
+<!ENTITY lsquor SDATA "[lsquor]"--=rising single quote, left (low)-->
+<!ENTITY ldquor SDATA "[ldquor]"--=rising dbl quote, left (low)-->
+
+<!ENTITY fflig  SDATA "[fflig ]"--small ff ligature-->
+<!ENTITY filig  SDATA "[filig ]"--small fi ligature-->
+<!ENTITY fjlig  SDATA "[fjlig ]"--small fj ligature-->
+<!ENTITY ffilig SDATA "[ffilig]"--small ffi ligature-->
+<!ENTITY ffllig SDATA "[ffllig]"--small ffl ligature-->
+<!ENTITY fllig  SDATA "[fllig ]"--small fl ligature-->
+
+<!ENTITY mldr   SDATA "[mldr  ]"--em leader-->
+<!ENTITY rdquor SDATA "[rdquor]"--rising dbl quote, right (high)-->
+<!ENTITY rsquor SDATA "[rsquor]"--rising single quote, right (high)-->
+<!ENTITY vellip SDATA "[vellip]"--vertical ellipsis-->
+
+<!ENTITY hybull SDATA "[hybull]"--rectangle, filled (hyphen bullet)-->
+<!ENTITY loz    SDATA "[loz   ]"--/lozenge - lozenge or total mark-->
+<!ENTITY lozf   SDATA "[lozf  ]"--/blacklozenge - lozenge, filled-->
+<!ENTITY ltri   SDATA "[ltri  ]"--/triangleleft B: l triangle, open-->
+<!ENTITY rtri   SDATA "[rtri  ]"--/triangleright B: r triangle, open-->
+<!ENTITY starf  SDATA "[starf ]"--/bigstar - star, filled-->
+
+<!ENTITY natur  SDATA "[natur ]"--/natural - music natural-->
+<!ENTITY rx     SDATA "[rx    ]"--pharmaceutical prescription (Rx)-->
+<!ENTITY sext   SDATA "[sext  ]"--sextile (6-pointed star)-->
+
+<!ENTITY target SDATA "[target]"--register mark or target-->
+<!ENTITY dlcrop SDATA "[dlcrop]"--downward left crop mark -->
+<!ENTITY drcrop SDATA "[drcrop]"--downward right crop mark -->
+<!ENTITY ulcrop SDATA "[ulcrop]"--upward left crop mark -->
+<!ENTITY urcrop SDATA "[urcrop]"--upward right crop mark -->
diff --git a/Doc/sgml/iso/ISOtech b/Doc/sgml/iso/ISOtech
new file mode 100644
index 0000000..cbda344
--- /dev/null
+++ b/Doc/sgml/iso/ISOtech
@@ -0,0 +1,73 @@
+<!-- (C) International Organization for Standardization 1986
+     Permission to copy in any form is granted for use with
+     conforming SGML systems and applications as defined in
+     ISO 8879, provided this notice is included in all copies.
+-->
+<!-- Character entity set. Typical invocation:
+     <!ENTITY % ISOtech PUBLIC
+       "ISO 8879:1986//ENTITIES General Technical//EN">
+     %ISOtech;
+-->
+<!ENTITY aleph  SDATA "[aleph ]"--/aleph =aleph, Hebrew-->
+<!ENTITY and    SDATA "[and   ]"--/wedge /land B: =logical and-->
+<!ENTITY ang90  SDATA "[ang90 ]"--=right (90 degree) angle-->
+<!ENTITY angsph SDATA "[angsph]"--/sphericalangle =angle-spherical-->
+<!ENTITY ap     SDATA "[ap    ]"--/approx R: =approximate-->
+<!ENTITY becaus SDATA "[becaus]"--/because R: =because-->
+<!ENTITY bottom SDATA "[bottom]"--/bot B: =perpendicular-->
+<!ENTITY cap    SDATA "[cap   ]"--/cap B: =intersection-->
+<!ENTITY cong   SDATA "[cong  ]"--/cong R: =congruent with-->
+<!ENTITY conint SDATA "[conint]"--/oint L: =contour integral operator-->
+<!ENTITY cup    SDATA "[cup   ]"--/cup B: =union or logical sum-->
+<!ENTITY equiv  SDATA "[equiv ]"--/equiv R: =identical with-->
+<!ENTITY exist  SDATA "[exist ]"--/exists =at least one exists-->
+<!ENTITY forall SDATA "[forall]"--/forall =for all-->
+<!ENTITY fnof   SDATA "[fnof  ]"--=function of (italic small f)-->
+<!ENTITY ge     SDATA "[ge    ]"--/geq /ge R: =greater-than-or-equal-->
+<!ENTITY iff    SDATA "[iff   ]"--/iff =if and only if-->
+<!ENTITY infin  SDATA "[infin ]"--/infty =infinity-->
+<!ENTITY int    SDATA "[int   ]"--/int L: =integral operator-->
+<!ENTITY isin   SDATA "[isin  ]"--/in R: =set membership-->
+<!ENTITY lang   SDATA "[lang  ]"--/langle O: =left angle bracket-->
+<!ENTITY lArr   SDATA "[lArr  ]"--/Leftarrow A: =is implied by-->
+<!ENTITY le     SDATA "[le    ]"--/leq /le R: =less-than-or-equal-->
+<!ENTITY minus  SDATA "[minus ]"--B: =minus sign-->
+<!ENTITY mnplus SDATA "[mnplus]"--/mp B: =minus-or-plus sign-->
+<!ENTITY nabla  SDATA "[nabla ]"--/nabla =del, Hamilton operator-->
+<!ENTITY ne     SDATA "[ne    ]"--/ne /neq R: =not equal-->
+<!ENTITY ni     SDATA "[ni    ]"--/ni /owns R: =contains-->
+<!ENTITY or     SDATA "[or    ]"--/vee /lor B: =logical or-->
+<!ENTITY par    SDATA "[par   ]"--/parallel R: =parallel-->
+<!ENTITY part   SDATA "[part  ]"--/partial =partial differential-->
+<!ENTITY permil SDATA "[permil]"--=per thousand-->
+<!ENTITY perp   SDATA "[perp  ]"--/perp R: =perpendicular-->
+<!ENTITY prime  SDATA "[prime ]"--/prime =prime or minute-->
+<!ENTITY Prime  SDATA "[Prime ]"--=double prime or second-->
+<!ENTITY prop   SDATA "[prop  ]"--/propto R: =is proportional to-->
+<!ENTITY radic  SDATA "[radic ]"--/surd =radical-->
+<!ENTITY rang   SDATA "[rang  ]"--/rangle C: =right angle bracket-->
+<!ENTITY rArr   SDATA "[rArr  ]"--/Rightarrow A: =implies-->
+<!ENTITY sim    SDATA "[sim   ]"--/sim R: =similar-->
+<!ENTITY sime   SDATA "[sime  ]"--/simeq R: =similar, equals-->
+<!ENTITY square SDATA "[square]"--/square B: =square-->
+<!ENTITY sub    SDATA "[sub   ]"--/subset R: =subset or is implied by-->
+<!ENTITY sube   SDATA "[sube  ]"--/subseteq R: =subset, equals-->
+<!ENTITY sup    SDATA "[sup   ]"--/supset R: =superset or implies-->
+<!ENTITY supe   SDATA "[supe  ]"--/supseteq R: =superset, equals-->
+<!ENTITY there4 SDATA "[there4]"--/therefore R: =therefore-->
+<!ENTITY Verbar SDATA "[Verbar]"--/Vert =dbl vertical bar-->
+
+<!ENTITY angst  SDATA "[angst ]"--Angstrom =capital A, ring-->
+<!ENTITY bernou SDATA "[bernou]"--Bernoulli function (script capital B)-->
+<!ENTITY compfn SDATA "[compfn]"--B: composite function (small circle)-->
+<!ENTITY Dot    SDATA "[Dot   ]"--=dieresis or umlaut mark-->
+<!ENTITY DotDot SDATA "[DotDot]"--four dots above-->
+<!ENTITY hamilt SDATA "[hamilt]"--Hamiltonian (script capital H)-->
+<!ENTITY lagran SDATA "[lagran]"--Lagrangian (script capital L)-->
+<!ENTITY lowast SDATA "[lowast]"--low asterisk-->
+<!ENTITY notin  SDATA "[notin ]"--N: negated set membership-->
+<!ENTITY order  SDATA "[order ]"--order of (script small o)-->
+<!ENTITY phmmat SDATA "[phmmat]"--physics M-matrix (script capital M)-->
+<!ENTITY tdot   SDATA "[tdot  ]"--three dots above-->
+<!ENTITY tprime SDATA "[tprime]"--triple prime-->
+<!ENTITY wedgeq SDATA "[wedgeq]"--R: corresponds to (wedge, equals)-->
diff --git a/Doc/sgml/iso/catalog b/Doc/sgml/iso/catalog
new file mode 100644
index 0000000..ef79493
--- /dev/null
+++ b/Doc/sgml/iso/catalog
@@ -0,0 +1,39 @@
+PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Arrow Relations//EN"	ISOamsa
+PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Binary Operators//EN"	ISOamsb
+PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Delimiters//EN"	ISOamsc
+PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Ordinary//EN"	ISOamso
+PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Relations//EN"	ISOamsr
+PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Negated Relations//EN"	ISOamsn
+PUBLIC "ISO 8879:1986//ENTITIES Box and Line Drawing//EN"	ISObox
+PUBLIC "ISO 8879:1986//ENTITIES Russian Cyrillic//EN"	ISOcyr1
+PUBLIC "ISO 8879:1986//ENTITIES Non-Russian Cyrillic//EN"	ISOcyr2
+PUBLIC "ISO 8879:1986//ENTITIES Diacritical Marks//EN"	ISOdia
+PUBLIC "ISO 8879:1986//ENTITIES Greek Letters//EN"	ISOgrk1
+PUBLIC "ISO 8879:1986//ENTITIES Monotoniko Greek//EN"	ISOgrk2
+PUBLIC "ISO 8879:1986//ENTITIES Greek Symbols//EN"	ISOgrk3
+PUBLIC "ISO 8879:1986//ENTITIES Alternative Greek Symbols//EN"	ISOgrk4
+PUBLIC "ISO 8879:1986//ENTITIES Added Latin 1//EN"	ISOlat1
+PUBLIC "ISO 8879:1986//ENTITIES Added Latin 2//EN"	ISOlat2
+PUBLIC "ISO 8879:1986//ENTITIES Numeric and Special Graphic//EN"	ISOnum
+PUBLIC "ISO 8879:1986//ENTITIES Publishing//EN"	ISOpub
+PUBLIC "ISO 8879:1986//ENTITIES General Technical//EN"	ISOtech
+
+PUBLIC "ISO 8879-1986//ENTITIES Added Math Symbols: Arrow Relations//EN"	ISOamsa
+PUBLIC "ISO 8879-1986//ENTITIES Added Math Symbols: Binary Operators//EN"	ISOamsb
+PUBLIC "ISO 8879-1986//ENTITIES Added Math Symbols: Delimiters//EN"	ISOamsc
+PUBLIC "ISO 8879-1986//ENTITIES Added Math Symbols: Ordinary//EN"	ISOamso
+PUBLIC "ISO 8879-1986//ENTITIES Added Math Symbols: Relations//EN"	ISOamsr
+PUBLIC "ISO 8879-1986//ENTITIES Added Math Symbols: Negated Relations//EN"	ISOamsn
+PUBLIC "ISO 8879-1986//ENTITIES Box and Line Drawing//EN"	ISObox
+PUBLIC "ISO 8879-1986//ENTITIES Russian Cyrillic//EN"	ISOcyr1
+PUBLIC "ISO 8879-1986//ENTITIES Non-Russian Cyrillic//EN"	ISOcyr2
+PUBLIC "ISO 8879-1986//ENTITIES Diacritical Marks//EN"	ISOdia
+PUBLIC "ISO 8879-1986//ENTITIES Greek Letters//EN"	ISOgrk1
+PUBLIC "ISO 8879-1986//ENTITIES Monotoniko Greek//EN"	ISOgrk2
+PUBLIC "ISO 8879-1986//ENTITIES Greek Symbols//EN"	ISOgrk3
+PUBLIC "ISO 8879-1986//ENTITIES Alternative Greek Symbols//EN"	ISOgrk4
+PUBLIC "ISO 8879-1986//ENTITIES Added Latin 1//EN"	ISOlat1
+PUBLIC "ISO 8879-1986//ENTITIES Added Latin 2//EN"	ISOlat2
+PUBLIC "ISO 8879-1986//ENTITIES Numeric and Special Graphic//EN"	ISOnum
+PUBLIC "ISO 8879-1986//ENTITIES Publishing//EN"	ISOpub
+PUBLIC "ISO 8879-1986//ENTITIES General Technical//EN"	ISOtech