Signature Element

The signature of a mapping rule serves two purposes:

1. it identifies the mapping rule by name, and
2. it declares some named parameters, which are passed into a mapping rule on activation.

The signature of a mapping rule is defined with the optional <signature> element. The <signature> element has a name attribute that defines the name of the mapping rule. The mapping rule’s optional named parameters are defined via the <signature>’s <params> child element; this element contains a sequence of one or more <param> elements that specify the names of the parameters via their name attribute:

<mapping match=”...”>
	<signature name=”myMappingRule”/>
	...
</mapping>

<mapping match=”...>
	<signature name=”myOtherMappingRule”>
		<params>
			<param name=”firstParam”/>
			<param name=”secondParam”/>
		</params>
	</signature>
</mapping>

myOtherMappingRule has two named parameters: firstParam, and secondParam. The value of a named parameters is a expression sequence and it may be access via the parmval expression element.