xpath expression from xml with namespace prefix

Question

I could not get the following xpath expression to work when the xml path namespace prefix set.

/bk:BookStore/bk:Books/bk:Book[text()=\'Time Machine\']

Answer 1

Or even better (and more portable), without the unnecessary prefix:

/*/*[local-name()='Books'] ... and so on

The function local-name ignores any prefix, which, as correctly stated by commenters, can vary.