most specific result is output. They also present a
ranking method to rank an answer by using an adapta-
tion of PageRank for XML documents. Their ranking
techniques are orthogonal to the retrieval method, and
thus can easily be incorporated into other works.
XSEarch focuses on the semantics and the ranking of
the results and during execution uses an all-pairs in-
terconnection index (i.e., record whether any two
nodes in an XML document are interrelated) to check
the connectivity between nodes, which is not efficient