<XPath xmlns:bar="http://example.org/bar" xmlns:baz="http://example.org/baz" xmlns:foo="http://example.org/foo" xml:lang="en-ie">

    (//. | //@* | //namespace::*) 

    [ 

              ancestor-or-self::bar:Something  and

              not (self::foo:Something)  and

              (self::text()  or

               (namespace-uri() != "")  or

               (string(self::node()) = namespace-uri(parent::node())))

    ]

</XPath>