Abstract
A query language for xml should be flexible enough to cover the whole range of information sources that can be labelled by xml, including databases and web documents. In this article we present a comparative analysis of several query languages that have been created for xml. We study sets of desirable traits both from the point of view of the semistructured data community (that emphasise especially very large databases, the integration of heterogeneous sources and data transformation into common interchange formats), and from the point of view of the information retrieval community (that emphasise especially full-text searches, manipulation of the sets of results, inclusion relationships, distances, and ranking of the result documents).
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