mDocument(nsnull),
    nsXULPrototypeElement(PRInt32 aLineNo)        : nsXULPrototypeNode(eType_Element, aLineNo),          mDocument(nsnull),          mNumChildren(0),          mChildren(nsnull),          mNumAttributes(0),          mAttributes(nsnull),          mClassList(nsnull)    {        MOZ_COUNT_CTOR(nsXULPrototypeElement);    }