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• The predicate supports checking of the values of job arguments and of order variables.
•  Variables support the following data types: string, number, booleanBoolean.
• Any jobs can add or modify order variables while an order is passing a workflow.
• A number of syntactical notations for variables are supported that provide access to:
  • the current value of a variable (may have been modified by a previous job),
  • the value that was returned by a specific JS7 - Job Instruction,
  • the original value of the variable as carried by the order.

•  If a predicate makes use of a variable that does not exist then the order stops with a FAILED state, except when a default value has been specified for the variable. 

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• The following syntax can be used to access the current value of a variable:
  • $varName
  • ${varName}
  • variable("varName") or variable('varName')
  • variable(key = "varName") or variable(key = 'varName')
• To avoid an order failing due to a non-existent variable, a default value can be specified with the following syntax:
  • variable("varName", default = "aString") or variable('varName', default = 'aString')
  • variable(key = "varName", default = "aString") or variable(key = 'varName', default = 'aString')
  •  Default values use one of the supported data types: string, number, booleanBoolean.
  • If the variable name is used with the key attribute then the order of appearance of the key and default attributes is arbitrary, i.e. variable(default = "aString", key = "varName")is possible too.
  • If the variable name is used without the key attribute then the variable name has to be used as the first argument of variable(...).

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• Boolean values are represented by the keyword true, the keyword false or by a converted variable value
• The keyword syntax with the predicate of an If Instruction is: true, false.
• A variable value of data type "string" can be converted to a Boolean data type with the toBoolean method using the following syntax:
  • ${varName}.toBoolean
  • variable(...).toBoolean
•  If the variable value is not a boolean Boolean data type then the order fails with the If Instruction.

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