[Nant-users] inference rules

[<nan...@xe...>]

How would I accomplish the following:
- for every *.sql file in 
- if the file date is older than a *.tag file with the same base name (or *.tag file doesn't exist)
- feed the *.sql file to a perl script (perl script.pl query.sql)
- update the file date of the *.tag file (or create it if it didn't exist)

In the make file I'm trying to replace, the above looks something like:

%.tag : %.sql
	perl $*.sql
	touch $< $@

As far as I can tell from the Nant documentation, I would have to:
- do a foreach over a file pattern
- parse the matching filename to construct equivalent *.tag
- compare the file dates (uptodate?)
- conditionally run perl script and touch *.tag file

This seems like a fairly common idiom in make but a hassle to do in Nant. I haven't been able to find any examples in Nant that address such a scenario. Is there a canonical approach in Nant to what would be an inference rule in make?

Thank you