[sv-ac] BNF definition of ## concatenation

Hi,

the BNF for ## concatenation of sequences has the following text:

cycle_delay_range ::=
	  ## integral_number
	| ## identifier
	| ## ( constant_expression )
	| ## [ cycle_delay_const_range_expression ]
cycle_delay_const_range_expression ::=
	  constant_expression : constant_expression
	| constant_expression : $

Without any explanation, it would seem that "identifier" can be
anything, including a variable. Yet, everything else including the
examples refers to constant expressions. Should there be some note in
the text and the BNF stating that identifier can only be a parameter or
something of that sort?

Thanks,

ed

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