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An identifier is a variable if it is not a function symbol or a constant. Variables can be valid or invalid. A valid variable starts with one of the predefined prefix categories, which are specified in section 2.2.3.2.32. It is followed by a dot symbol and an attribute (for example, machine.datetime or app.count).
An invalid variable is one that is not in the list of prefixes. If a variable is not valid, the expression evaluation terminates and the expression is treated as false.
The value of a variable is retrieved from a specific location, which depends on the variable's category. For example, content.CID is retrieved from the content header, and license.LID is retrieved from the license.
The existence of a variable can be checked with the exists function.