XQL and Proximal Nodes

We consider the recently proposed XQL language, which is designed to query XML documents by content and structure. We show that an already existing model, namely ``Proximal Nodes??, is the only one that addresses all the complex querying operations defined by XQL and that suggests an efficient implementation for them.

http://www.haifa.il.ibm.com/sigir00-xml/final-papers/RBaetza/att1.htm