Xerces-C XSModel port from Java

Question

I am attempting to port some Java code utilizing Xerces v3.2.2 that loads a schema file, retrieves the XSModel* and parses it into some custom data structures.

JAVA

import org.apache.xerces.XSLoader;
import org.apache.xerces.XSModel;

XSImplementation xsLoader = null;
XSLoader xsLoader = null;
XSModel xsModel = null;

xsImpl = (XSImplmentation) domRegistry.getDOMImplementation("XS-Loader");
xsLoader = xsImpl.createXSLoader(null);
xsModel = xsLoader.loadURI("path-to-schema.xsd");
myDataStruct = new MyDataStruct(xsModel);

I have been unable to find anything in Xerces-c documentation that would yield similar results. As far as I can tell, I can access the XSModel* from the xercesc::GrammarResolver* through the xercesc::AbstractDOMParser but this would require me to derive from the parser as it is a protected function.

CPP

#include <xercesc/parsers/XercesDOMParser.hpp>

using namespace xercesc;

class MyDOMParser : public XercesDOMParser
{
public:
    using AbstractDOMParser::getGrammarResolver;
};    

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

    MyDOMParser parser;
    parser.loadGrammar("path-to-schema.xsd", Grammar::GrammarType::SchemaGrammarType);
    auto resolver = parser.getGrammarResolver();
    auto xsModel = resolver->getXSModel();
    MyDataStruct myDataStruct{xsModel};
    return 0;
}

Is this the route I must go? Will this even work? Are there examples out in the wild that show a better way of doing this?

Answer 1

The above solution I attempted for CPP does appear to achieve what I'm trying to accomplish. By deriving from XercesDOMParser I am able to access the GrammarResolver and therefore the XSModel. The model seems to contain the data my data structure requires for parsing.