If you have trouble with Xerces 1.4.0, try 1.2.3 instead. It supports a large subset of the XML schema language. Apigen is still in an Alpha state, and documentation on using the tool is not yet available. However, we have evolved it to the point of initial release. However, please also contact Eric Dashofy for assistance.
Main class is edu.uci.isr.apigen.gui.ApiGenGui .