[NeXus-committee] need help with class specifications: what's the meaning parentheses in member lists?

[Joachim Wuttke]

For each base class, there is a members table in the PDF doc.
Some entries in the columns "Name and Atributes" and "Type"
are in parentheses. What does this mean?
I would expect an explanation in the introductory pages 90-92,
but don't find one.
- Joachim

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