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The structures notation (see section 5.1)
is used to define
and access variable attributes and their arguments.
This makes the code independent of the number of attributes
and positions of their arguments.
Wherever appropriate, the libraries described in this document
describe their attributes in this way, e.g.
suspend with [inst:I, constrained:C, bound:B]
says that the structure name is suspend and that
it has (at least) three arguments with the corresponding names.
Warwick Harvey
2004-08-07