1. Multi-level Operator Combination in XML Query Processing;Al-Khalifa,2002
2. Structural joins. A primitive for efficient XML query pattern matching;Al-Khalifa,2002
3. Storing and Querying XML Data in Object-Relational DBMSs;Runapongsa,2002
4. XML path language (XPath) 2.0;Berglund,2002
5. XML schema part 2: Datatypes. W3C Recommendation;Biron,2001