[sv-ac] What is the meaning of 'match' here?

Hi,
As per 2009 SV draft LRM:
"It shall be an error if there exists a match of the named
sequence for which an inout or output local variable formal argument is 
unassigned at the completion
of the match. At the completion of a match of the instance of the named 
sequence, the value of
the inout or output local variable formal argument shall be cast to the 
type of and assigned to the
local variable whose reference is the associated actual argument."

What is the meaning of 'match' here. One example snippet will be better.

-- 
Regards
Surya




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