XML has long been an important tool for archivists. The addition of XQuery provides a simple and easy-to-learn tool to extract, transform, and manipulate the large amounts of XML data that archival repositories have committed resources to develop and maintain – particularly EAD finding aids. XQuery allows archivists to make use of that data. Furthermore, using XQuery to query EAD finding aids, rather than merely reformat them with XSLT, forces archivists to look at finding aids as data. This will provide better knowledge of how EAD may be used and further understanding of how finding aids may be better encoded. This article provides a simple how-to guide to get archivists to start experimenting with XQuery.
Wiedeman, Gregory. "XQuery for Archivists: Understanding EAD Finding Aids as Data." Practical Technology for Archives 3 (November 2014)