SVG1.2 (temporal?) conditional processing

In a city map viewer, rendering a filter effect for currently open
businesses is a practical feature that can now be implemented with
animation.  However conditional processing is a technique that seemingly
could compress the encoding of potentially many schedules as well as
simplify the implementation in viewers.

For example, the schedule for a business open Monday through Friday from
9AM to 5PM might be encoded by extending ISO 8601's recurring ordinal
date notation to a regular expression such as R/W??-[1-5]T09:00/P08H

I believe there are many other practical features in maps that would be
promoted by temporal conditional processing.

Greg