Where can I find information about TCriterionVisitor?

What kind of information you need? TCriterionVisitor is an internal class TMS Aurelius, which is actually not being used yet by the way, thus subject to change.

I'm looking to add expression with or/and to TCriteria and found the TCriterionVisitor.
But that is not the object to use, because it is an internal class.

Thanks for the information.