[JJTree] Set of mandatory and optional tokens (each once)

Hi

Is there a smart solution or a JJTree mechanism to deal with the following:

A set of Parameter Value pairs should be parsed.
Some of these pairs are mandatory and the rest is optional.
The set of pairs is also unordered.

With JJTree, is it possible to mask certain pairs as mandatory?

Or is it needed to add some JAVA functionality (e.g.
checkExistenceOfRequiredParamaters(...))?

--
Sincerely,

Helko Glathe

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