What is the correct XPath for choosing attributes that contain “foo”?

Question

Given this XML, what XPath returns all elements whose prop attribute contains Foo (the first three nodes):

Answer 1

This XPath will give you all nodes that have attributes containing 'Foo' regardless of node name or attribute name:

//attribute::*[contains(., 'Foo')]/..

Of course, if you're more interested in the contents of the attribute themselves, and not necessarily their parent node, just drop the /..

//attribute::*[contains(., 'Foo')]