As traditional relational databases and new native XML databases are maturing as viable storage solutions for XML data, application developers are faced with SQL extended to provide XML support along with new query languages, such as XPath and XQuery. At the Indiana University Digital Library Program, various data-driven digital library collection applications are developed. A Java Query Analyzer (JQA) was developed to simplify interaction with heterogeneous database and storage systems. JQA interprets generic user query input, containing familiar Internet search engine operators, and transforms that user input into SQL, XPath, or XQuery statements, which can then be used to query data collections stored in a variety of relational database or native XML storage systems.
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