Need vendor class identifier advice

Niall O'Reilly niall.oreilly at
Mon Sep 16 10:28:22 UTC 2013

On 13 Sep 2013, at 22:13, Doug Barton wrote:

> I could create 2 match classes and put 'deny class members of' options
> in for both of them, but that seems inefficient. :)  I'm trying to write
> a custom boolean match like this:

	"... seems inefficient" indeed; but by how much, I wonder?

	ISTR reading somewhere that "subclass" matching is significantly
	more efficient than complex "match if ..." specifications.  This
	may compensate for the overhead of the extra "deny".

	Niall O'Reilly

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