How to find elements by attribute namespace in XPath

Question

I\'m trying to use XPath to find all elements that have an element in a given namespace.

For example, in the following document I want to find the foo:bar

Answer 1

You could try

//*[namespace-uri()='http://foo.example.com' or @*[namespace-uri()='http://foo.example.com']]

It will give you element foo:bar and element doodah (if you change tal:quux to foo:quux in your XML-data):

  Content
  Content
  Content

Is that what you want?