[PPL-devel] ppl/doc definitions.dox

[Enea Zaffanella]

CVSROOT:	/cvs/ppl
Module name:	ppl
Changes by:	zaffanella at cs.unipr.it	2008-10-19 16:20:21

Modified files:
	doc            : definitions.dox 

Log message:
	Some improvements in the specification of syntactic GDs:
	1) the generic ones are those that are supported (maybe minimally) by
	all semantic GDs; the specific ones are not supported at all by
	some semantic GDs;
	2) listed subclasses of generic GDs (constraints and congruences):
	explained that each semantic GD "optimally supports" some of these
	subclasses; for optimally supported subclasses, no exception is thrown
	and a best approximation semantics is obtained; for the non-optimally
	supported ones, exceptions or coarse approximations may be obtained.
	3) noted that the best approximation property applies to single constraints
	or congruences, not to their systems.
	
	Other changes:
	- not all OK methods support the optional Boolean argument;
	- improved explanation of conversion operators with a computational
	complexity argument.

Patches:
http://www.cs.unipr.it/cgi-bin/cvsweb.cgi/ppl/doc/definitions.dox.diff?cvsroot=ppl&r1=1.222&r2=1.223