[silvestrov]

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.