17.1. Introduction
Introduced as a schema-less, self-describing data representation language, XML (Bray et al. 2000) has rapidly emerged as the standard for information interchange on the World Wide Web. Database researchers have actively participated in developing standards centered on XML, in particular data models and query languages for XML. Many XML query languages have been proposed, and some XML Management Systems (XMS) with those query languages implemented are available for use.
Current XMS can be divided into two categories: XML-enabled databases and native XML databases. XML-enabled databases, typically relational databases, such as DB2 XML Extender from IBM, Informix, Microsoft SQL Server 2000, and Oracle- 8i and -9i (Bourret 2001a ...
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