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The XML Query WG page (http://www.w3.org/XML/Query/) contains a section on Implementations. The first item in this section is: "1. The W3C XPath 2 and XQuery 1 Grammar Test Page (http://www.w3.org/2010/02/qt-applets/) features Java applets that read expressions and show the resulting parse tree." New applets that correspond to the 14 June 2011 WDs for XPath 3.0 and XQuery 3.0 should be published at: http://www.w3.org/2011/06/qt-applets/ The item above should reflect these new XQuery 3.0 and XPath 3.0 applets.
The applets have, in fact, been published as requested (that is, the applets corresponding to the 14 June 2011 drafts are available at http://www.w3.org/2011/08/qt-applets/), and the XML Query WG's public page (first item under Implementations) properly points to the applets.