app engine modify xml -

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I am writing a GWT app running on an app engine, which needs to modify the XML file server side. As far as I know that there is no way to modify the XML file in the war directory or any subdirectory, what are the other possibilities to store that data? Can I use data store in some way or should I look for more storage space and get it there (if such a suggestion?)?

Any help is appreciated!

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