(Q5) In the document "zoo.xml", find <tiger> elements in the namespace defined by www.abc.com/names that contain any subelement in the namespace defined by www.xyz.com/names.

NAMESPACE abc = "www.abc.com/names"
NAMESPACE xyz = "www.xyz.com/names"
document("zoo.xml")//abc:tiger[xyz:*]

XSLT equivalent to (Q5)

(Use the in-scope namespace declarations)
document("zoo.xml")//abc:tiger[xyz:*]