Update:
New version allows traversal of XML sub-elements, as shown below.
Traverse Element Tree
Description:
A tool that allows extracting specific data from an XML file.
Source: http://whatrevitwants.blogspot.com.au/2015/11/read-xml-files-and-use-in-revit-with.html
Dynamo Nodes 
Update: I have updated the Python code on this node. The ‘parent detection’ component was much too slow. The faster version will be in the next Bakery update.
copied comment:
Ricardo Zepeda February 21, 2016 at 7:14 AM
Great Work!!, have you try it on dynamo 9.1? im getting null values