Bettina Fazzinga Sergio Flesca Andrea Pugliese Vague Queries on Peer-to-Peer XML Databases. 287-297 2007 conf/dexa/2007 DEXA http://dx.doi.org/10.1007/978-3-540-74469-6_29 db/conf/dexa/dexa2007.html#FazzingaFP07