RE: [selectors] Assistance requested in figuring out the data model of pseudo-elements

± A "generator of a disjunction" makes :matches() a special syntax form, not a
± real pseudo-class.  That would be somewhat easier, but it would also be
± weird.  Dunno if I wanna go down that road.

Also, it's not a disjunction. If it was, the following two would be equivalent:

	a:matches(.b c, .d e) 
	a.b c, a.d e

If I understood the situation correctly, they are not.