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Use-Mappings Element (implicit arguments)

The value for aexpression element in a mapping rule may also be supplied by named arguments. These named arguments in the use-mappings do not need equivalent parameters declared in the mapping rule’s signature.

Implicit arguments in are defined with the optionalelement. Each argument is defined with anelement. Theelement has a name attribute that defines the name of the argument:

   … some expression sequence …  …  … some expression sequence …    …  …  …

The implicit arguments are common to every mapping rule specified in the use-mappings. Thus, every mapping rule refer to by theelement may access the value of an implicit named argument via aexpression element.