Scott Newman Z. Meral Özsoyoglu A Tree-Structured Query Interface for Querying Semi-Structured Data. 127-130 2004 conf/ssdbm/2004 SSDBM http://doi.ieeecomputersociety.org/10.1109/SSDBM.2004.9 db/conf/ssdbm/ssdbm2004.html#NewmanO04