Xerces

Apache Xerces 129 (Apache-2.0) is two validating parsers. Xerces-J 2.12.2 (January 2022) implements DOM, SAX and XSD 1.0, with XSD 1.1 in a separate build; a repackaged Xerces is the JDK's built-in parser (its factory class is com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl). Xerces-C++ 3.3.0 (September 2024; Ubuntu 225 ships 3.2.4) is the C++ sibling. Its DOMCount sample validates the catalog against XSD 1.1 Types's XSD through a schema-location hint:

xsi=http://www.w3.org/2001/XMLSchema-instance
sed "s#<catalog #<catalog xmlns:xsi=\"$xsi\" xsi:noNamespaceSchemaLocation=\"catalog.xsd\" #" \
  booknest-catalog.xml > hinted.xml
sed 's/>39.50</>-39.50</' hinted.xml > bad.xml
for f in hinted.xml bad.xml; do DOMCount -v=always -n -s -f $f | sed -E "s/ [0-9]+ ms//"; done

hinted.xml: (89 elems).
Error at file /home/dev/v7-l1/ch02/s2-28/bad.xml, line 42, char 43
  Message: value '-39.50' must be greater than or equal to minExclusive facet value '0'
Errors occurred, no output available

minExclusive means strictly greater, so "greater than or equal to" is a slip in Xerces-C's message, not a different rule. The JDK's javax.xml.validation reports the same fault as cvc-minExclusive-valid.

Xerces

#include <xercesc/parsers/XercesDOMParser.hpp>
#include <xercesc/util/PlatformUtils.hpp>

XERCES_CPP_NAMESPACE_USE

int main() {
    XMLPlatformUtils::Initialize();

    XercesDOMParser parser;
    parser.parse("books.xml");
    DOMDocument* doc = parser.getDocument();

    XMLPlatformUtils::Terminate();
    return 0;
}