A string value
that represents the PDF/A revision number as specified by Document management - Electronic document file format for long-term preservation specification
(ISO-19005-1:2005). PDFARevisionNumber variables
are used to configure the PDF/A Revision Number property for the generatePDFOutput operation and transformPDF operation operations
of the Output service.
For information about data that can be accessed using Xpath Expressions,
see Data items.