It looks like I was confused by the statements found here under
"Features" (https://xerces.apache.org/xerces-c/):
* Conforms to
o XML 1.0 (Third Edition)
<http://www.w3.org/TR/2004/REC-xml-20040204/>, W3C Recommendation
o XML 1.1 (First Edition)
<http://www.w3.org/TR/2004/REC-xml11-20040204/>, W3C
Recommendation (Note: section 2.13 Normalization Checking has
not been implemented)
After doing some more research, I realize that I am looking for XSD 1.1
support (which Xerces-J apparently has, but Xerces-C++ does not) and not
XML 1.1 which has nothing to do with XSD.
Or did I overlook something else?