One feature which I'm missing which is very useful for CMS systems etc is a standard syntax for implementation specific callbacks/macros. E.g. a macro that ret

One feature which I'm missing which is very useful for CMS systems etc is a standard syntax for implementation specific callbacks/macros. E.g. a macro that returns todays date, todays great offer, etc. Or a "number of days until xxx" for countdowns until some event. His attribute syntax is very close. A posssible macro syntax use {@ as leading marker, e.g. {@macroname position=left} or There is {@daysuntil date=20230710} days to launch.