Fix for null pointer dereference in the case where the expression is empty and the case-insensitive option is specified.

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Supress DTD error message for attribute refering to unknown entity when attribute not used.  Patch from John Kim.

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In the fix for XERCESC-1592, code to set xmlns="" that was moved from retrieveNamespaceMappping to preprocessSchema was not executed for imported schemas

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Move helper function to the CPP file, so that the proper type (SOCKET) can be used, instead of unsigned short

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In the Windows registry, the code page for an encoding is stored in MIME\Database\Charset\<encoding>\@InternetEncoding, not in MIME\Database\Charset\<encoding>\@Codepage (XERCESC-1092)

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- Perform XInclude at the end of each endElement callback, instead of doing it at the end (so that we clone smaller trees, instead of cloning the entire document)
- XInclude now reports notation and entity conflicts
- XInclude now reports invalid xi elements
- Fixed base URI handling in fallback elements
- Fixed memory leaks

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Fold DOMElementNSImpl::getBaseURI and DOMElementImpl::getBaseURI into DOMElementImpl, so that it still works when an element contains both DOMAttrNSImpl and DOMAttrImpl attributes

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- Each SchemaInfo should have its own NamespaceScope (pre-populated with the content of the including grammar) instead of pointing to a stack of the NamespaceScope of the topmost grammar (otherwise, if A includes B and then C, C sees the namespace prefixes declared by B)
- SchemaGrammar should not be used to store the transient NamespaceScope objects
- The stack of NamespaceScope is updated by each DOMElement that has attributes declaring new namespace prefixes (XERCESC-1592)

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Use existing define from XMemory to control whether or not corresponding operator delete overloads are defined.  This silences warnings on more compilers.

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IconvGNU and IconvFBSD transcoders override application-set locale, XERCESC-1660 (patch by Boris Kolpackov)

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Even if the XSTS suite thinks differently, the XMLSchema 1.1 clarifies that two values derived from the same value space should be treated as equals; so find out the common ancestor and use it to perform the comparison

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