[SpecGL] Proposal for Error mechanisms section

AI-20050131-5 (KD) to propose additions to error mechanism section, 
2005-02-07

Techniques 4.5 GP A
[[[
one should keep in mind that extensibility may need new syntax tokens 
([WEB-ARCH], extensibility), which can be smoothen by the use of 
mustIgnore and mustUnderstand policies: in the first case, a processor 
is required to ignore only the content that it cannot understand, in 
the second one, it is required to consider as an error that kind of 
content
]]] - http://www.w3.org/TR/2004/WD-qaframe-spec-20041122/

New text:

Techniques 4.5 GP A

one should keep in mind that extensibility may need new syntax tokens 
([WEB-ARCH], extensibility), which can be smoothen by the use of two 
policies:
	 * "must Understand": This mechanism is required when the data are 
critical for the technology, or when their lost would result in major 
flaws.
	 * "must Ignore": This mechanism will be used when the processing of 
data would create a major flaw in the application. Then it becomes safe 
to ignore them altogether.



-- 
Karl Dubost - http://www.w3.org/People/karl/
W3C Conformance Manager
*** Be Strict To Be Cool ***