Re-examined the problems of configuring a "minimal" library.

Synchronized the header files with the library code in order
to assure that all the various conditionals (LIBXML_xxxx_ENABLED)
were the same in both.  Modified the API database content to more
accurately reflect the conditionals.  Enhanced the generation
of that database.  Although there was no substantial change to
any of the library code's logic, a large number of files were
modified to achieve the above, and the configuration script
was enhanced to do some automatic enabling of features (e.g.
--with-xinclude forces --with-xpath).  Additionally, all the format
errors discovered by apibuild.py were corrected.
* configure.in: enhanced cross-checking of options
* doc/apibuild.py, doc/elfgcchack.xsl, doc/libxml2-refs.xml,
  doc/libxml2-api.xml, gentest.py: changed the usage of the
  <cond> element in module descriptions
* elfgcchack.h, testapi.c: regenerated with proper conditionals
* HTMLparser.c, SAX.c, globals.c, tree.c, xmlschemas.c, xpath.c,
  testSAX.c: cleaned up conditionals
* include/libxml/[SAX.h, SAX2.h, debugXML.h, encoding.h, entities.h,
  hash.h, parser.h, parserInternals.h, schemasInternals.h, tree.h,
  valid.h, xlink.h, xmlIO.h, xmlautomata.h, xmlreader.h, xpath.h]:
  synchronized the conditionals with the corresponding module code
* doc/examples/tree2.c, doc/examples/xpath1.c, doc/examples/xpath2.c:
  added additional conditions required for compilation
* doc/*.html, doc/html/*.html: rebuilt the docs

include/libxml/parserInternals.h

@@ -199,7 +199,7 @@ XMLPUBVAR unsigned int xmlParserMaxDepth;
 #define IS_LETTER_CH(c) xmlIsBaseChar_ch(c)
 
 /**
- * IS_ASCII_LETTER(c)
+ * IS_ASCII_LETTER:
  * @c: an xmlChar value
  *
  * Macro to check [a-zA-Z]
@@ -209,7 +209,7 @@ XMLPUBVAR unsigned int xmlParserMaxDepth;
 				 ((0x61 <= (c)) && ((c) <= 0x7a)))
 
 /**
- * IS_ASCII_DIGIT(c)
+ * IS_ASCII_DIGIT:
  * @c: an xmlChar value
  *
  * Macro to check [0-9]
@@ -311,12 +311,6 @@ XMLPUBFUN void XMLCALL
 						 const xmlChar * str1,
 						 const xmlChar * str2);
 #endif
-/**
- * Entities
- */
-XMLPUBFUN void XMLCALL			
-			xmlHandleEntity		(xmlParserCtxtPtr ctxt,
-						 xmlEntityPtr entity);
 
 /**
  * Input Streams.
@@ -347,23 +341,10 @@ XMLPUBFUN xmlChar * XMLCALL
 			xmlSplitQName		(xmlParserCtxtPtr ctxt,
 						 const xmlChar *name,
 						 xmlChar **prefix);
-XMLPUBFUN xmlChar * XMLCALL		
-			xmlNamespaceParseNCName	(xmlParserCtxtPtr ctxt);
-XMLPUBFUN xmlChar * XMLCALL		
-			xmlNamespaceParseQName	(xmlParserCtxtPtr ctxt,
-						 xmlChar **prefix);
-XMLPUBFUN xmlChar * XMLCALL		
-			xmlNamespaceParseNSDef	(xmlParserCtxtPtr ctxt);
-XMLPUBFUN xmlChar * XMLCALL		
-			xmlParseQuotedString	(xmlParserCtxtPtr ctxt);
-XMLPUBFUN void XMLCALL			
-			xmlParseNamespace	(xmlParserCtxtPtr ctxt);
 
 /**
  * Generic production rules.
  */
-XMLPUBFUN xmlChar * XMLCALL		
-			xmlScanName		(xmlParserCtxtPtr ctxt);
 XMLPUBFUN const xmlChar * XMLCALL		
 			xmlParseName		(xmlParserCtxtPtr ctxt);
 XMLPUBFUN xmlChar * XMLCALL		
@@ -435,6 +416,7 @@ XMLPUBFUN void XMLCALL
 			xmlParsePEReference	(xmlParserCtxtPtr ctxt);
 XMLPUBFUN void XMLCALL			
 			xmlParseDocTypeDecl	(xmlParserCtxtPtr ctxt);
+#ifdef LIBXML_SAX1_ENABLED
 XMLPUBFUN const xmlChar * XMLCALL		
 			xmlParseAttribute	(xmlParserCtxtPtr ctxt,
 						 xmlChar **value);
@@ -442,6 +424,7 @@ XMLPUBFUN const xmlChar * XMLCALL
 			xmlParseStartTag	(xmlParserCtxtPtr ctxt);
 XMLPUBFUN void XMLCALL			
 			xmlParseEndTag		(xmlParserCtxtPtr ctxt);
+#endif /* LIBXML_SAX1_ENABLED */
 XMLPUBFUN void XMLCALL			
 			xmlParseCDSect		(xmlParserCtxtPtr ctxt);
 XMLPUBFUN void XMLCALL			
@@ -493,13 +476,6 @@ XMLPUBFUN void XMLCALL
  */
 #define XML_SUBSTITUTE_BOTH 	3
 
-XMLPUBFUN xmlChar * XMLCALL
-		xmlDecodeEntities		(xmlParserCtxtPtr ctxt,
-						 int len,
-						 int what,
-						 xmlChar end,
-						 xmlChar  end2,
-						 xmlChar end3);
 XMLPUBFUN xmlChar * XMLCALL
 		xmlStringDecodeEntities		(xmlParserCtxtPtr ctxt,
 						 const xmlChar *str,
@@ -537,7 +513,6 @@ XMLPUBFUN int XMLCALL			xmlStringCurrentChar	(xmlParserCtxtPtr ctxt,
 						 const xmlChar *cur,
 						 int *len);
 XMLPUBFUN void XMLCALL			xmlParserHandlePEReference(xmlParserCtxtPtr ctxt);
-XMLPUBFUN void XMLCALL			xmlParserHandleReference(xmlParserCtxtPtr ctxt);
 XMLPUBFUN int XMLCALL			xmlCheckLanguageID	(const xmlChar *lang);
 
 /*
@@ -566,6 +541,7 @@ XMLPUBFUN htmlParserCtxtPtr XMLCALL	htmlCreateFileParserCtxt(const char *filenam
  * Specific function to keep track of entities references
  * and used by the XSLT debugger.
  */
+#ifdef LIBXML_LEGACY_ENABLED
 /**
  * xmlEntityReferenceFunc:
  * @ent: the entity
@@ -581,6 +557,36 @@ typedef	void	(*xmlEntityReferenceFunc)	(xmlEntityPtr ent,
   
 XMLPUBFUN void XMLCALL		xmlSetEntityReferenceFunc	(xmlEntityReferenceFunc func);
 
+XMLPUBFUN xmlChar * XMLCALL		
+			xmlParseQuotedString	(xmlParserCtxtPtr ctxt);
+XMLPUBFUN void XMLCALL
+                        xmlParseNamespace       (xmlParserCtxtPtr ctxt);
+XMLPUBFUN xmlChar * XMLCALL		
+			xmlNamespaceParseNSDef	(xmlParserCtxtPtr ctxt);
+XMLPUBFUN xmlChar * XMLCALL		
+			xmlScanName		(xmlParserCtxtPtr ctxt);
+XMLPUBFUN xmlChar * XMLCALL		
+			xmlNamespaceParseNCName	(xmlParserCtxtPtr ctxt);
+XMLPUBFUN void XMLCALL	xmlParserHandleReference(xmlParserCtxtPtr ctxt);
+XMLPUBFUN xmlChar * XMLCALL		
+			xmlNamespaceParseQName	(xmlParserCtxtPtr ctxt,
+						 xmlChar **prefix);
+/**
+ * Entities
+ */
+XMLPUBFUN xmlChar * XMLCALL
+		xmlDecodeEntities		(xmlParserCtxtPtr ctxt,
+						 int len,
+						 int what,
+						 xmlChar end,
+						 xmlChar  end2,
+						 xmlChar end3);
+XMLPUBFUN void XMLCALL			
+			xmlHandleEntity		(xmlParserCtxtPtr ctxt,
+						 xmlEntityPtr entity);
+
+#endif /* LIBXML_LEGACY_ENABLED */
+
 #ifdef IN_LIBXML
 /*
  * internal only