REVARG -- &rev=n URL revision parameter of current topic

• Syntax: %REVARG%
• %REVARG% If a topic revision is requested in the URL, it returns the revision of the current topic suitable for concatenation to the view query parameters. Otherwise returns an empty string.
• Expands to: (simulated) &rev=3 (actual) &rev=1
• Related: REVINFO, REVTITLE