XPath: How to check if an attribute exists?

Question

Given the following XML, how do I write an XPath query to pull nodes where the attribute foo exists?:

<node1>
  <node2>
    <node3 foo='bar'></node3>
    <node3></node3>
    <node3 bar='foo'></node3>
    <node3 foo='foobar'></node3>
  </node2>
</node1>

Answer 1

Short and sweet:

//*[@foo]

Of course you should use a more specific expression. But with [@attributeName] you get all nodes which have that attribute.