diff --git a/Doc/sgml/oasis/catalog b/Doc/sgml/oasis/catalog
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--- /dev/null
+++ b/Doc/sgml/oasis/catalog
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+PUBLIC "-//OASIS//DTD Exchange Table Model 19960430//EN" "exchange.txt"
diff --git a/Doc/sgml/oasis/exchange.txt b/Doc/sgml/oasis/exchange.txt
new file mode 100644
index 0000000..a6bbf02
--- /dev/null
+++ b/Doc/sgml/oasis/exchange.txt
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+
+
+<!-- EXCHANGE TABLE MODEL DECLARATION MODULE -->
+
+<!-- This set of declarations defines the Exchange Table Model as of the
+     date shown in the Formal Public Identifier (FPI) for this entity.
+
+     This set of declarations may be referred to using a public external
+     entity declaration and reference as shown in the following two lines:
+
+<!ENTITY % calstbls PUBLIC "-//OASIS//DTD Exchange Table Model 19960430//EN">
+%calstbls;
+
+     If various parameter entities used within this set of declarations
+     are to be given non-default values, the appropriate declarations
+     should be given before calling in this package (i.e., before the
+     "%calstbls;" reference).
+
+     NOTE:  This set of declarations assumes a NAMELEN of 32 as is used in
+     the standard CALS defined SGML declaration.
+-->
+
+<!-- This entity includes a set of element and attribute declarations
+     that partially defines the Exchange table model.  However, the model
+     is not well-defined without the accompanying natural language
+     description of the semantics (meanings) of these various elements,
+     attributes, and attribute values.  The semantic writeup, also available
+     from OASIS, should be used in conjunction with this entity.
+-->
+
+<!-- In order to use the Exchange table model, various parameter entity
+     declarations are required.  A brief description is as follows:
+
+     ENTITY NAME      WHERE USED              WHAT IT IS
+
+     %bodyatt         In ATTLIST of:          Additional (non-table related)
+                      table element(s)        attributes on the overall
+                                              (wrapper) table element(s)
+
+     %yesorno         In ATTLIST of:          An attribute declared value
+                      almost all elements     for a "boolean" attribute
+
+     %titles          In content model of:    The "title" part of the model
+                      table element(s)        group for the table element(s)
+
+     %paracon         In content model of:    The "text" (logical content)
+                      <entry>                 of the model group for <entry>
+
+     %tbl.table.name  In declaration of:      The name(s) of the "table"
+                      table element(s)        element(s)
+
+     %tbl.table-titles.mdl In content model of: The model group for the title
+                      table elements(s)       part of the content model for
+                                              table element(s)
+
+     %tbl.table-main.mdl In content model of: The model group for the main part
+                      table elements(s)       (not including titles) of the
+                                              content model for table element(s)
+
+     %tbl.table.mdl   In content model of:    The model group for the content
+                      table elements(s)       model for table element(s),
+                                              often (and by default) defined
+                                              in terms of %tbl.table-titles.mdl
+                                              and %tbl.table-main.mdl
+
+     %tbl.table.excep In content model of:    The exceptions for the content
+                      table element(s)        model for table element(s)
+
+     %tbl.table.att   In ATTLIST of:          Additional attributes on the
+                      table element(s)        table element(s)
+
+     %tbl.tgroup.mdl  In content model of:    The model group for the content
+                      <tgroup>                model for <tgroup>
+
+     %tbl.tgroup.att  In ATTLIST of:          Additional attributes on the
+                      <tgroup>                <tgroup> element
+
+     %tbl.tbody.att   In ATTLIST of:          Additional attributes on the
+                      <tbody>                 <tbody> element
+
+     %tbl.colspec.att In ATTLIST of:          Additional attributes on the
+                      <colspec>               <colspec> element
+
+     %tbl.hdft.name   In declaration of:      The name(s) of the table
+                      head/foot element(s)    head and foot element(s)
+
+     %tbl.hdft.mdl    In content model of:    The model group for the content
+                      head/foot element(s)    model for head/foot element(s)
+
+     %tbl.hdft.excep  In content model of:    The exceptions for the content
+                      head/foot element(s)    model for head/foot element(s)
+
+     %tbl.hdft.att    In ATTLIST of:          Additional attributes on the
+                      head/foot element(s)    head/foot element(s)
+
+
+     %tbl.row.mdl     In content model of:    The model group for the content
+                      <row>                   model for <row>
+
+     %tbl.row.excep   In content model of:    The exceptions for the content
+                      <row>                   model for <row>
+
+     %tbl.row.att     In ATTLIST of:          Additional attributes on the
+                      <row>                   <row> element
+
+     %tbl.entry.mdl   In content model of:    The model group for the content
+                      <entry>                 model for <entry>
+
+     %tbl.entry.excep In content model of:    The exceptions for the content
+                      <entry>                 model for <entry>
+
+     %tbl.entry.att   In ATTLIST of:          Additional attributes on the
+                      <entry>                 <entry> element
+
+     This set of declarations will use the default definitions shown below
+     for any of these parameter entities that are not declared before this
+     set of declarations is referenced.
+-->
+
+<!-- These definitions are not directly related to the table model, but are
+     used in the default CALS table model and may be defined elsewhere (and
+     prior to the inclusion of this table module) in the referencing DTD. -->
+
+<!ENTITY % bodyatt "">
+<!ENTITY % yesorno 'NUMBER'  -- no if zero(s),
+                                yes if any other digits value -->
+<!ENTITY % titles  'title?'>
+<!ENTITY % paracon '#PCDATA' -- default for use in entry content -->
+
+<!--
+The parameter entities as defined below change and simplify the CALS table
+model as published (as part of the Example DTD) in MIL-HDBK-28001.  The
+resulting simplified DTD has support from the OASIS vendors and is
+therefore more interoperable among different systems.
+
+These following declarations provide the Exchange default definitions
+for these entities.  However, these entities can be redefined (by giving
+the appropriate parameter entity declaration(s) prior to the reference
+to this Table Model declaration set entity) to fit the needs of the
+current application.
+
+Note, however, that changes may have significant effect on the ability to
+interchange table information.  These changes may manifest themselves
+in useability, presentation, and possible structure information degradation.
+-->
+
+<!ENTITY % tbl.table.name       "table">
+<!ENTITY % tbl.table-titles.mdl "%titles;,">
+<!ENTITY % tbl.table-main.mdl   "tgroup+">
+<!ENTITY % tbl.table.mdl        "%tbl.table-titles.mdl; %tbl.table-main.mdl;">
+<!ENTITY % tbl.table.excep      "-(%tbl.table.name)">
+<!ENTITY % tbl.table.att        "
+    pgwide      %yesorno;       #IMPLIED ">
+<!ENTITY % tbl.tgroup.mdl       "colspec*,thead?,tbody">
+<!ENTITY % tbl.tgroup.att       "">
+<!ENTITY % tbl.tbody.att        "">
+<!ENTITY % tbl.colspec.att      "">
+<!ENTITY % tbl.hdft.name        "thead">
+<!ENTITY % tbl.hdft.mdl         "row+">
+<!ENTITY % tbl.hdft.excep       "">
+<!ENTITY % tbl.hdft.att         "">
+<!ENTITY % tbl.row.mdl          "entry+">
+<!ENTITY % tbl.row.excep        "">
+<!ENTITY % tbl.row.att          "">
+<!ENTITY % tbl.entry.mdl        "(%paracon;)*">
+<!ENTITY % tbl.entry.excep      "">
+<!ENTITY % tbl.entry.att        "">
+
+<!-- =====  Element and attribute declarations follow. =====  -->
+
+<!--
+     Default declarations previously defined in this entity and
+     referenced below include:
+     ENTITY % tbl.table.name       "table"
+     ENTITY % tbl.table-titles.mdl "%titles;,"
+     ENTITY % tbl.table-main.mdl   "tgroup+"
+     ENTITY % tbl.table.mdl        "%tbl.table-titles; %tbl.table-main.mdl;"
+     ENTITY % tbl.table.excep      "-(%tbl.table.name)"
+     ENTITY % tbl.table.att        "
+                        pgwide          %yesorno;       #IMPLIED "
+-->
+
+<!ELEMENT %tbl.table.name; - - (%tbl.table.mdl;) %tbl.table.excep; >
+
+<!ATTLIST %tbl.table.name
+        frame           (top|bottom|topbot|all|sides|none)      #IMPLIED
+        colsep          %yesorno;                               #IMPLIED
+        rowsep          %yesorno;                               #IMPLIED
+        %tbl.table.att;
+        %bodyatt;
+>
+
+<!--
+     Default declarations previously defined in this entity and
+     referenced below include:
+     ENTITY % tbl.tgroup.mdl    "colspec*,thead?,tbody"
+     ENTITY % tbl.tgroup.att    ""
+-->
+
+<!ELEMENT tgroup - O (%tbl.tgroup.mdl;) >
+
+<!ATTLIST tgroup
+        cols            NUMBER                                  #REQUIRED
+        colsep          %yesorno;                               #IMPLIED
+        rowsep          %yesorno;                               #IMPLIED
+        align           (left|right|center|justify|char)        #IMPLIED
+        %tbl.tgroup.att;
+>
+
+<!--
+     Default declarations previously defined in this entity and
+     referenced below include:
+     ENTITY % tbl.colspec.att   ""
+-->
+
+<!ELEMENT colspec - O EMPTY >
+
+<!ATTLIST colspec
+        colnum          NUMBER                                  #IMPLIED
+        colname         NMTOKEN                                 #IMPLIED
+        colwidth        CDATA                                   #IMPLIED
+        colsep          %yesorno;                               #IMPLIED
+        rowsep          %yesorno;                               #IMPLIED
+        align           (left|right|center|justify|char)        #IMPLIED
+        char            CDATA                                   #IMPLIED
+        charoff         NUTOKEN                                 #IMPLIED
+        %tbl.colspec.att;
+>
+
+<!--
+     Default declarations previously defined in this entity and
+     referenced below include:
+     ENTITY % tbl.hdft.name     "thead"
+     ENTITY % tbl.hdft.mdl      "row+"
+     ENTITY % tbl.hdft.excep    ""
+     ENTITY % tbl.hdft.att      ""
+-->
+
+<!ELEMENT %tbl.hdft.name; - O (%tbl.hdft.mdl;)  %tbl.hdft.excep;>
+
+<!ATTLIST %tbl.hdft.name;
+        valign          (top|middle|bottom)                     #IMPLIED
+        %tbl.hdft.att;
+>
+
+<!--
+     Default declarations previously defined in this entity and
+     referenced below include:
+     ENTITY % tbl.tbody.att     ""
+-->
+
+<!ELEMENT tbody - O (row+)>
+
+<!ATTLIST tbody
+        valign          (top|middle|bottom)                     #IMPLIED
+        %tbl.tbody.att;
+>
+
+<!--
+     Default declarations previously defined in this entity and
+     referenced below include:
+     ENTITY % tbl.row.mdl       "entry+"
+     ENTITY % tbl.row.excep     ""
+     ENTITY % tbl.row.att       ""
+-->
+
+<!ELEMENT row - O (%tbl.row.mdl;) %tbl.row.excep;>
+
+<!ATTLIST row
+        rowsep          %yesorno;                               #IMPLIED
+        valign          (top|middle|bottom)                     #IMPLIED
+        %tbl.row.att;
+>
+
+
+<!--
+     Default declarations previously defined in this entity and
+     referenced below include:
+     ENTITY % paracon           "#PCDATA"
+     ENTITY % tbl.entry.mdl     "(%paracon;)*"
+     ENTITY % tbl.entry.excep   ""
+     ENTITY % tbl.entry.att     ""
+-->
+
+<!ELEMENT entry - O (%tbl.entry.mdl;) %tbl.entry.excep; >
+
+<!ATTLIST entry
+        colname         NMTOKEN                                 #IMPLIED
+        namest          NMTOKEN                                 #IMPLIED
+        nameend         NMTOKEN                                 #IMPLIED
+        morerows        NUMBER                                  #IMPLIED
+        colsep          %yesorno;                               #IMPLIED
+        rowsep          %yesorno;                               #IMPLIED
+        align           (left|right|center|justify|char)        #IMPLIED
+        char            CDATA                                   #IMPLIED
+        charoff         NUTOKEN                                 #IMPLIED
+        valign          (top|middle|bottom)                     #IMPLIED
+        %tbl.entry.att;
+>
+
+