UCD for query

[Walter Landry]

Hello,

I am running a TAP service, and I want to store the full ADQL query in
the resulting table.  What UCD should I use for that?  I could not
find anything suitable in the UCD1+ list

  http://www.ivoa.net/documents/REC/UCD/UCDlist-20070402.html

Should I use something like meta.adql?

Thanks,
Walter Landry