[xml] adding attributes to nodeset

["Prashant R" <ramapra gmail com>]

Using the API's

xmlXPathNodeSetCreate and xmlXPathNodeSetAdd

I am using this as i need to canonicalize a portion of the xml (sub-tree). 

Basically i am iterating over each node and recursively  adding the node and its children and next nodes to the nodeset  . 

I am able to add element nodes and the element content however after canonicalization i find that all attributes are missing. 

Is there a different API / option to add the attributes to the nodeset  ?