Validation has been turned of by default in Cocoon because
it is an expensive operation. In a server environment where
you will be sending the same document hundreds or thousands
of times a day (depending on site traffic), the added overhead
of validation is too expensive to do for each request.
Ideally Validation is done after document creation, and then
never again. I do not know if there is even an option to
turn on validation at this time. Check your cocoon.properties
file for anything that looks promissing.
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