References to the physical features (e.g. chains of holes) on the roll copies
that carry this symbol. Since the association might be debatable,
it can be annotated. There might be e.g. doubts about the meaning
and correct transcription of a feature on a physical roll.
This points to a feature by its @id.
ReadonlyidA unique identifier for this object.
The text content of the symbol.
A textual symbol, e.g. a label or annotation found on the roll.
See
crm:E33 Linguistic Object