Ingo Schmitt Nadine Schulz Thomas Herstel WS-QBE: A QBE-Like Query Language for Complex Multimedia Queries. 222-229 2005 conf/mmm/2005 MMM http://doi.ieeecomputersociety.org/10.1109/MMMC.2005.72 db/conf/mmm/mmm2005.html#SchmittSH05