Attribute references and SETC variables

The symbol referenced by an attribute reference of length (L'), type (T'), scaling (S'), integer (I'), and defined (D'), can only be an ordinary symbol. The name of the ordinary symbol can, however, be specified in three different ways:

• The name of the ordinary symbol itself
• The name of a symbolic parameter whose value is the name of the ordinary symbol
• The name of a SETC symbol whose value is the name of the ordinary symbol