Parameters (Section 6.2) can have array data. The dimensions of such an array if given by the Dimension element(s) of TParameter.
Those elements are of type ssc:GDimensions.

The problem is that GDimensions supports both fixed, literal size (using the size attribute), and an indirect size by pointing to a connector (using the sizeConnector attribute). I would argue that in the the context of a TParameter, only the literal size is well-defined.

Proposal: clarify that array dimensions may only use the size attribute. Suggested place: the table that describes the Dimension elements at the very end of Section 6.2, just before 6.2.1.