String variable in XPDL (how big can it be?)

INTRO:
In my process activites can exchange data through XPDL variables.
(or through external DB or file)

I used String XPDL variables in the past.
Suppose my JavaClassToolagent has INOUT variable of String. (named result)


QUESTION:
How long can be XPDL String variable. can it be like 20 lines of text
? (e.g. 2000 characters ?)
(like in Java where the memory is basically the limit ?) (or it must
be <256chars or some other limit ?)


Vojtech



P.S. I am back in Shark environemnt after some break (I needed to
develop certain data access libraries)  :-)

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