An XML Light Integration Virtual Engine
XLive is a light XQuery mediator. It deals with a subset of XQuery. It supports the basic for where return expression of XQuery and nested queries at any level in the where clause, so that nested XML can be composed from the data sources. Multiple data sources are possible using wrappers and adapters. In the current version, the relational DBMSs Oracle 9i and MySQL, and the native XML DBMSs Xyleme, XHive, Exist are supported. For being integrated, a source must conform to a Java XQuery API or to a simple Web service API.