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Trying to make XOOPS compliant with government accessibility legislation is futile - because many countries have such legislation and their laws are different and change all the time. XOOPS is international software.
If there is a sensible and accepted international standard for accessibility (and I don't know) then I'm all for XOOPS trying to comply with it, but using the standard of any one government isn't going to work.
I am sure that it wouldn't be hard to find a non-compliant UK government site (if you get hauled up, it might be amusing to check the compliance of sites operated by, say, the police or justice department :)