function getQualifier(oAnnotationNode) {
	return oAnnotationNode.getAttribute("Qualifier")
		|| oAnnotationNode.parentNode.nodeName === "Annotations"
			&& oAnnotationNode.parentNode.getAttribute("Qualifier");
}
Gets the qualifier for an <Annotation> element, possibly inherited from the direct parent
<Annotations> element.

@param {Element} oAnnotationNode An <Annotation> element
@returns {string} The qualifier or some falsy value