Many conditions, actions, and tokens support dynamic variable expansion in their attributes or content. Where supported, an embedded reference of the form $<variable-name>$ is replaced with the value of the local or global variable with the given name. $<variable-name>$ must be a legal variable name. For information on what is a legal XML name, see W3C Extensible Markup Language (XML).
If the given variable does not exist, the reference is replaced with the empty string. Where it is desirable to use a single $ and not have it interpreted as a variable reference, it should be escaped with an additional $ (for example, You owe me $$100.00). See the Identity Manager 3.6 DTD Reference for the content attributes that support variable expansion.