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Erschienen in:
2000 | OriginalPaper | Buchkapitel
Combining the Power of Searching and Querying
verfasst von : Sara Cohen, Yaron Kanza, Yakov Kogan, Werner Nutt, Yehoshua Sagiv, Alexander Serebrenik
Erschienen in: Cooperative Information Systems
Verlag: Springer Berlin Heidelberg
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EquiX is a search language for XML that combines the power of querying with the simplicity of searching. Requirements for search languages are discussed and it is shown that EquiX meets the necessary criteria. Both a graphical abstract syntax and a formal concrete syntax are presented for EquiX queries. In addition, the semantics is defined. It is shown that EquiX has an evaluation algorithm that is polynomial under combined complexity.EquiX combines pattern matching, quantification and logical expressions to query both the data and meta-data of XML documents. The result of a query in EquiX is a set of XML documents. A DTD describing the result documents is derived automatically from the query.