Hi Artem, My first remark is about the compatibility with the Query Plugin. I believe you should make it compatible by changing the QueryPlugin. The plugin hasn't been currently advertised and transformed as the default query mecanism, si changing it would not be too bad. It should because the default query mecanism, so that users can migrate easily from Database to JCR and vice-versa. Another remark will be about handling Archive. I believe this will need to be changed in the XWiki Store. I have prototype code that separated the versioning of documents in a separate store interface. But I think it will have to go further and we will need to discuss a very independent versioning API. Ludovic Artem Melentyev a écrit : -- Ludovic Dubost XPertNet: http://www.xpertnet.fr/ Blog: http://www.ludovic.org/blog/ XWiki: http://www.xwiki.com Skype: ldubost AIM: nvludo Yahoo: ludovic