IEEE TCDL Bulletin
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TCDL Bulletin
Volume 3   Issue 2
Summer 2007


Extended XQuery for Digital Libraries

Alex Dekhtyar, Ionut E. Iacob, Kevin Kiernan, Dorothy C. Porter
University of Kentucky
Lexington, KY 40506
{dekhtyar, eiaco0}, {kiernan, dporter}


Documents have, in general, a multihierarchical structure (such as physical organization in the form of pages and lines, content organization in the form of paragraphs and sentences, etc.). Searching multihierarchical XML encoding presents a number of unique challenges for both computer scientists and document experts.

We present an extension of the XQuery language suitable for searching multihierarchical XML. Our implementation is part of the Edition Production and Presentation Technology (EPPT) – a complex platform for preparing and presenting electronic editions of documents. This platform includes a data model for multihierarchical document-centric XML, an extensive suite of editing tools, and a query language, Extended XPath, for searching multihierarchical documents. Extended XPath, an extension of the XPath query language, offers us the benefit of clear semantics for path expressions over multihierarchical XML. At the same time, to achieve full query language functionality, path expression languages need to be "wrapped" by a declarative query language, such as XQuery. XQuery is an attractive XML query language for document-centric XML processing as it provides built-in support for presentation of query results.

EPPT has HTML presentation capabilities and we have enhanced it with an extended version of XQuery FLWOR expressions over multihierarchical XML documents. More information about EPPT can be found at: <>.

Thumbnail image of poster

For a larger view of Figure 1, click here.


The work of the first author was supported, in part, by the NSF grant ITR-0219924 and the NSF grant ITR-0325063. The work of the second and third authors is supported in part by a Collaborative Research Award from the NEH (RZ-20887-02) and the Andrew W. Mellon Foundation.


© Copyright 2007 Alex Dekhtyar, Ionut E. Iacob, Kevin Kiernan, and Dorothy C. Porter
Some or all of these materials were previously published in the Proceedings of the 6th ACM/IEEE-CS Joint Conference on Digital libraries, ACM 1-59593-354-9.

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