XSTypeDefinition::getNamespace() is missing a const qualifier

The function

XSTypeDefinition::getNamespace()

should have a const qualifier, just like

XSTypeDefinition::getName()

has.

$ cd xerces-c-3.1.1/src/xercesc/framework/psvi/
$ grep "XMLCh* getName" XSTypeDefinition.hpp
virtual const XMLCh* getName() const = 0;
virtual const XMLCh* getNamespace() = 0;