Dot Net Parsing Oracle Access Manager XML
This is slightly off topic, and extends well beyond just Oracle Access Manager but was a little less than obvious to me the first time I had to do this in .NET (well, also the second time). If the XML you are trying to process with SelectNodes or SelectSingleNode contains a namespace then you need to associate that namespace with a namespace manager and include it in the SelectNodes or SelectSingleNode statement (see example below).
XmlDocument xml = new XmlDocument();
XmlNamespaceManager ns = new XmlNamespaceManager(xml.NameTable);