[CWB] Dramatic texts in cqpweb

[Graham Ranger -- UAPV]

Hello,
And thanks again to those who answered my previous question re: setting 
up dramatic texts with limited xml encoding for use in cqpweb.
I have a further question, which follows on from the previous -- and may 
be just as naive.
Given a speaker tag <sp> with attribute "who", such that an intervention 
by a character called Bill in a play might be <sp 
who="Bill">Hello!</sp>, can cqpweb provide a way for extracting 
occurrences within all interventions by Bill? I've tried in various 
ways, by don't seem to be able to include this in the categorisation 
schemes, which, I suspect, only apply to texts.
Thanks in advance for any help on this.
Best,
Graham.