Unbelievable that InDesign is still on a 25 year old standard here: prehistoric by normal tech standards. One can only conclude that this is just not a priority for Adobe. But it's hard to see what else to do if you need to add some processing for exported markup. The only alternative I can see is writing my own scripts etc, to use outside InDesign. Definitely not ideal.
Unbelievable that InDesign is still on a 25 year old standard here: prehistoric by normal tech standards. One can only conclude that this is just not a priority for Adobe. But it's hard to see what else to do if you need to add some processing for exported markup. The only alternative I can see is writing my own scripts etc, to use outside InDesign. Definitely not ideal.