Proposal: the match attribute on p:viewport should not be an AVT #830
The viewport step integrates into pipeline construction fairly deeply. I'd like to make the
I also think that if it's allowed to be dynamic, users could reasonably expect to use
Maybe no one asked for it, but the fact that I couldn't use a match expression with a variable in Calabash was the reason I didn't write an article about XProc 2 years ago. On my way to XML London, I created this example pipeline. What was intended as a showcase for a straightforward pipeline (extract files from a zip based on a regex that matches their names), proved to be inexplicably difficult. I had to use the match attribute of p:add-attribute in order to attach an extract="yes" option to the archive listing because I couldn't access the regex variable in the match attribute of p:viewport.
referenced this issue
Jul 8, 2019
I don't know where you or Achim got the impression that it should have been possible to set this value dynamically in 1.0 (there are no AVTs and you can't use
However, I take your response as a "hard no" to my proposal :-)
Simple matter of implementation, I guess.