document: Beyond XML and RDF : the versatile web query language xcerpt Applications and services that access Web data are becoming increasingly more useful and wide-spread . Current main-stream Web query languages such as XQuery , XSLT , or SPARQL , however , focus only on one of the different data formats available on the Web . In contrast , Xcerpt is a emphversatile semi-structured query language , i.e. , a query language able to access all kinds of Web data such as XML and RDF in the same language reusing common concepts and language constructs . To integrate heterogeneous data and as a foundation for Semantic Web reasoning , Xcerpt also provides rules . Xcerpt has a visual companion language , visXcerpt , that is conceived as a mere rendering of the ( textual ) query language Xcerpt using a slightly extended CSS . Both languages are demonstrated along a realistic use case integrating XML and RDF data highlighting interesting and unique features . Novel language constructs and optimization techniques are currently under investigation in the Xcerpt project ( cf. @ urlhttp : \/ \/ xcerpt.org \/ ) .
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