Channel Specific Variables
User-defined variables may have different values depending on the output channel being published.
The PAGE_NUM variable in example 2 (above), is suitable for paper publishing.
If the assembly is to be published in both paper and eCTD electronic channels, the PAGE_NUM variable above could be assigned to the paper output channel. Another PAGE_NUM variable should be assigned to the electronic output channel with a more appropriate value such as: ${LABBR}, Page $LR of $LT.
The ${} notation is required so that the comma directly follows the Abbreviated Leaf name when the variable is resolved.
