Retrieves variables set with the report-variable macro in the current context.
Variables are set within a local context, generally that of the current report, or at the top level, the current page.
Reporting, from version 3.2.0
The following are the list of keys which this supplier will return a value for.
Retrieves the current value of the specified variable name
See the Report Variable macro reference page for some examples of using this supplier.