xquery problems

2 xquery problems 1: If i have some xml in the form <root> <a>hello</a> <b> <bi>hiya</bi> <bii>hey</bii> </b> <c/> <d>hello again</d> </root> how can I a) count the nodes? i.e. a, b, bi, bii, c, d so 6 b) count the nodes that are non empty a, bi, bii, d so 4 ? 2: if i search for a string/substring in an xmldata type and it is found in one or more places, how can i get its position back? e.g. if i search for hi (i.e. in hiya) how can i get my query to return 2,1 - 2(the second node of the root), 1(the first node of the second node or the root node) ? ## Deliverables an optimized query if possible that will be as fast as possible if possible