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XML Indexing: XML Needs More Than XML Indices

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Executive Summary

Effectively and efficiently querying a collection of XML documents is a challenge for several reasons. An XML document has a hierarchical, potentially recursive, structure without any predefined limit to the number of levels. Within a given collection the structure of the documents may vary from one to another in both the depth and structure of the hierarchy. The XML model has sometimes been called "Semi-Structured" to highlight the fact that in the same document structured data are freely mixed with textual information, and that content and meta data are conjoined in order to be machine readable and, perhaps, to even be read by humans.

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