XIPL/XASM is a basic environment to build high-level Image Processing operations using a XML-based language. The idea is to compile the high-level XIPL language into a low-level one, XASM (XML-based too), using XSLT technology.
Evaluates XPath 1.0 expressions over W3C XML Schema definitions to get a compile-time prediction of nodes that will be matched at run-time. Project homepage: http://xpath-on-schema.sourceforge.net/