Attributes for the <argList> Element

The <argList> element must have at least one attribute. Each attribute is treated as a named variable to be passed to the called service. The name of each attribute must be an identifier without substitution variable references. The attribute name should correspond to the name of a parameter in the called service. The value of each attribute is an arbitrary string that can include references to variables in the enclosing scope, but not other arguments within the <argList>.