Date Added: Oct 2009
XML and its related technologies have now been in use for almost a decade. There has been considerable amount of effort both from research and industry focusing on XML, XQuery/XPath, XSLT and SQL/XML processing in the database. Many research prototypes and industrial products have been built to satisfy the XML use cases. This paper reviews several use cases where XML databases are leveraged to build real-world XML applications. The authors discuss the lessons learnt in supporting both data-centric and document-centric XMLDB applications within a single database system and the need for the implementation of different XML storage, index and query optimisation techniques for different XML use cases.