[CWB] Allowed symbols in "id" metadata field

[mansur]

Hey!

My metadata looks like this:
<text id="alish.1" source="Абдулла Алиш. Куршеләр" date="" lang="Tatar"
genre="">

cqp processes it just fine. But I get this error during including this to
cqpweb:
Bad metadata value on input file line 1 in column 0: n``alish.1'' .

I found that it is because of ".". I also found that I cannot use the "-"
symbol. What symbols are allowed to use in "id" field? Thank you!

With best wishes,
Mansur
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