Function ShallowClone

3rdparty/tinyxml2/tinyxml2.h:1926–1928

	void MarkInUse(const XMLNode* const);

    virtual XMLNode* ShallowClone( XMLDocument* /*document*/ ) const override{
        return 0;
    }
    virtual bool ShallowEqual( const XMLNode* /*compare*/ ) const override{
        return false;
    }