Apache Cocoon offers not only a useful array of functionality in this space,
but its 2.1 version provides a powerful toolkit for orchestrating and building extensible web apps and web services. More specifcily, Cocoon 2.1 is coming with the following major modules:
1) XMLForm - an server side implementation of XForms, which makes perfect sence for building REST web services coherent with UI forms.
2) Flow control - page flow control framework
3) Portal infrastructure
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