[xml] Are schemas supported?

[Toshio Kuratomi <badger prtr-13 ucsc edu>]

Are XML Schemas supported for validity checking?  If not is this something
on the wishlist?

-Toshio
-- 
badger  \"Life is like a china candy dish: filled with brightly promising
@prtr-13 \  sweets, quickly emptied.  lasts a bit.  dropped.  it breaks."
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