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XDBM is an XQuery implementation on the W3C's EXI binary XML format.
XDBM version 2 will be an XQuery implementation that uses EXIP to handle binary XML in the EXI format adopted by the W3C. It will, like EXIP, aim to be as small as possible so that it runs well on resource constrained devices. It is still in the project design stage.
An rich application development platform for both desktops and the Internet. It supports technologies like XSLT, XQuery, XML Schema, RELAX NG, XHTML, SVG, and a new scripting language - Candle (Common ApplicatioN Development LanguagE).
criutils is a library set written in C which make easier to work with strings, linked list, timestamps, databases (postgreSQL, xquery and sqlite) and CGI. You can imagine criutils like a little extension of glibc. Check the wiki for a full documentation.
XPN is relies on a non relational native XML database, where XML documents are stored in a compressed form and indices enables fast access to structure and content, thus enabling a fast evaluation of XQuery queries.