internal int LookupIdElement(string id, out XPathNode[] pageElem) {
XPathNodeRef nodeRef;
if (this.idValueMap == null || !this.idValueMap.ContainsKey(id)) {
pageElem = null;
return 0;
}
// Extract page and index from XPathNodeRef
nodeRef = this.idValueMap[id];
pageElem = nodeRef.Page;
return nodeRef.Index;
}