1. ebXML Business Process Specification Schema Technical Specification v2.0.4.
http://docs.oasis-open.org/ebxml-bp/2.0.4/OS/spec/ebxmlbp-v2.0.4-Spec-os-en-html/ebxmlbp-v2.0.4-Spec-os-en.htm
2. EuroPass Specifications.
http://interop.europass.cedefop.europa.eu/data-model/xml-resources/
3. Open Travel Specifications.
http://www.opentravel.org/
4. EbXML Specifications.
http://www.ebxml.org/specs/index.htm
5. Marchetti, E.: Automatic XML schema generation from UML application profile, vol. 485, pp. 485–487. Springer-Verlag Wien (2005)