[CWB] Classification metadata

[Graham Ranger -- UAPV]

Hello to all,
A quick question re: classification metadata. In a historical corpus of 
medical case studies, it would be nice to include classification 
information on the field of medicine concerned. However, in many cases, 
several fields are involved. The solution to this might be just to 
indicate field_1, field_2, field_3, etc., but this makes restricted 
searches a little unwieldy. I was wondering if there is a more elegant 
way of doing this, something like just one field, with boolean 
alternatives i.e. "neurology|gastroenterology|neurology", for a 
fictitious case involved these three fields, 
"neurology|gastroenterology" for a case involving just there two fields, 
etc.
I hope this makes sense. Thanks in advance for any assistance.
Best wishes,
Graham.
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