added --nonet option fixing #112803 by adding --nonet when calling

* xmllint.c doc/xmllint.xml: added --nonet option
* doc/Makefile.am: fixing #112803 by adding --nonet when calling
  xsltproc or xmllint
* doc/xmllint.xml doc/xmllint.1: also added --schema doc and
  rebuilt
* HTMLparser.c: cleaned up the HTML parser context build when
  using an URL
Daniel
diff --git a/doc/xmllint.xml b/doc/xmllint.xml
index 3ab1467..9bb9f87 100644
--- a/doc/xmllint.xml
+++ b/doc/xmllint.xml
@@ -79,6 +79,8 @@
 	<arg>--stream</arg>
 	<arg>--chkregister</arg>
 	<arg>--relaxng</arg>
+	<arg>--schema</arg>
+	<arg>--nonet</arg>
       </group>
       <arg><option><replaceable>xmlfile</replaceable></option></arg>
   </cmdsynopsis>
@@ -441,6 +443,19 @@
 	  validation.</simpara>
 	</listitem>
       </varlistentry>
+      <varlistentry>
+	<term><option>--schema</option> <replaceable>schema</replaceable></term>
+	<listitem>
+	  <simpara>Use a W3C XML Schema file named <replaceable>schema</replaceable> for validation.</simpara>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>
+      <option>--nonet</option></term>
+	<listitem>
+	  <simpara>Do not use the Internet to fetch DTD's or entities.</simpara>
+	</listitem>
+      </varlistentry>
     </variablelist>
   </refsect1>