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Currently there is no way to validate these files. The xmlns isn't the sufficient information. Even for XML catalogs there must be information where XML schemas are located. I think the best way is to use the xsi:schemaLocation attribute showing to XML schema resource. (should be implemented for all project types)
Freeform project.xml's - the only ones for which it really matters much - are already validated interactively when you edit them by hand. *** This issue has been marked as a duplicate of 42686 ***
closed