// MS has a bug that those namespace declaration nodes in
// the node-set are written to output. Related spec section is:
// http://www.w3.org/TR/2001/REC-xml-c14n-20010315#ProcessingModel
// MS has a bug that those namespace declaration nodes in
// the node-set are written to output. Related spec section is:
// http://www.w3.org/TR/2001/REC-xml-c14n-20010315#ProcessingModel