[SimpleParse] How to refer to simpleparse.common in grammar definition?

[Christine C M. <we...@MI...>]

When defining a grammar I'd like one of my tokens to be a date in the ISO
8601 format. I notice that simpleparse.common has some modules for parsing
ISO dates (iso_date,iso_date_loose), how to refer to this in the grammar
spec of another language?

Something like awesome.def:

token := isodate / spam
spam := 'python'/'monty'

Where isodate matches if simpleparser.common.iso_date matches.

Feel free to point me back to Google or the docs if this was something
simple I overlooked.

-xStine