Postprint version. Published in 16th International Conference on Database and Expert Systems Applications: Copenhahen, Denmark, Volume 3588, August 1, 2005, pages 576-585.
NOTE: At the time of publication, the author Alex Dekhtyar was not yet affiliated with Cal Poly.
To properly encode properties of textual documents using XML, multiple markup hierarchies must be used, often leading to conflicting markup in encodings. Text Encoding Initiative (TEI) Guidelines  recognize this problem and suggest a number of ways to incorporate multiple hierarchies in a single well-formed XML document. In this paper, we present a framework for processing XPath queries over multi-hierarchical XML documents represented using fragmentation, one of the TEI-suggested techniques. We define the semantics of XPath over DOM trees of fragmented XML, extend the path expression language to cover overlap in markup, and describe FragXPath, our implementation of the proposed XPath semantics over fragmented markup.