Apache XMLBeans packages for DDI 1.0, 1.1, 1.2, 1.2.1, 1.2.2, 1.3, 2.0 and 2.1. XMLBeans is a technology for accessing XML by binding it to Java types. For more information, see http://xmlbeans.apache.org/
queXML is a simple XML schema for designing questionnaires. Included are stylesheets to administer a questionnaire in PDF (paper), CASES and LimeSurvey (was: phpSurveyor). queXML is compatible with the DDI standard for data description.