DOM conformance tests

[Curt Arnold]

I was able to port the NIST Java DOM test suite to JUnit and then on to CppUnit for Xerces-C.  The source is in the CVS of xmlconf.sourceforge.net (http://sourceforge.net/cvs/?group_id=8114) but I haven't updated the site.   Running the tests resulted in three conformance errors.  One is a legitimate error, notation.getSystemId() always returns null, due to a pretty obvious bug in DOMParser::notationDecl:   void DOMParser::notationDecl (     const   XMLNotationDecl&    notDecl     , const bool                isIgnored ) {  NotationImpl* notation = ((DocumentImpl*)fDocument.fImpl)->createNotation(notDecl.getName());  notation->setPublicId(notDecl.getPublicId()); - notation->setPublicId(notDecl.getPublicId()); + notation->setSystemId(notDecl.getSystemId());    fDocumentType->notations->setNamedItem( notation );   } The other two conformance issues were with negative values for the count argument of characterData.substringData() and characterData.deleteData().  The DOM spec states that negative values for the count value should throw an INDEX_SIZE_ERR exception.  In Xerces-C, the arguments are defined as unsigned int which results in the negative values in the tests being interpreted as very large values.   In a perfect world, it would probably be best to remove the unsigned qualifiers from the arguments so that the behavior would parallel that of the Java implementation.