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Jason Hunter (co-creater of JDOM) talking about what he considers the next "cool thing". XQuery is a standard language for querying XML, or anything that can appear as XML such as relational databases, HTML pages, SGML, anything with some structure...

• XQuery is easier to read and write than XSLT
• Better for jagged hierarchical data than SQL
• Better than procedural access since the engine can optimise

Open source implementations are eXist, Saxon, Qizx/open and Qexo. Jason hopes it'll be an XSLT killer (at least for developers).