Named elements in xtables

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Dear all,

I just discovered that pandoc produces xtables with named elements which 
produces these errors.

setup           > error in line 2, namespace '498', key 'head,'
setup           > error in line 2, namespace '498', key 'lastrow,'
setup           > error in line 11, namespace '498', key 'body,'
setup           > error in line 21, namespace '498', key 'lastrow,'
setup           > error in line 30, namespace '498', key 'foot,'
setup           > error in line 2, namespace '498', key 'head,'
setup           > error in line 2, namespace '498', key 'lastrow,'
setup           > error in line 11, namespace '498', key 'body,'
setup           > error in line 21, namespace '498', key 'lastrow,'
setup           > error in line 30, namespace '498', key 'foot,'
setup           > error in line 2, namespace '498', key 'head,'
setup           > error in line 2, namespace '498', key 'lastrow,'
setup           > error in line 11, namespace '498', key 'body,'
setup           > error in line 21, namespace '498', key 'lastrow,'
setup           > error in line 30, namespace '498', key 'foot,'

AFAICS it is not possible to define a named tablehead like this:

\definextablehead[head]

ConTeXt does not stop, so no big problem.

But it would offer styling opportunities in a production chain with 
pandoc if it is possible.

Do I miss something?

juh
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