(Revert) Keep longdesc in legacy.rnc (though still support it for the W3C service).
(Revert) Keep longdesc in legacy.rnc (though still support it for the W3C service).

YOTOV-LIMITED/validator,tripu/validator,takenspc/validator,tripu/validator,takenspc/validator,tripu/validator,sammuelyee/validator,tripu/validator,sammuelyee/validator,YOTOV-LIMITED/validator,validator/validator,validator/validator,sammuelyee/validator,YOTOV-LIMITED/validator,tripu/validator,takenspc/validator,YOTOV-LIMITED/validator,validator/validator,YOTOV-LIMITED/validator,sammuelyee/validator,validator/validator,takenspc/validator,validator/validator,takenspc/validator,sammuelyee/validator