ACTION-446 and Re: Deriving BLD PS from the XML syntax (Was: Re: escaping quotes)

Michael Kifer wrote:

>>E.g. metadata everywhere does probably not make sense in the 
>>PS; but why not allow it in the XML? If the only reason is that the XML 
>>is derived from the PS (in the sense of the EBNF), my point is that it 
>>does not have to.
> 
> 
> Several rule systems use metadata at the presentation level.
> [...]

Absolutely. And, as you pointed out already, some metadata may impact 
the semantics in some rule languages (or something that is usually 
considered metadata; e.g. certainty factors etc).

But not all the metadata need be at the presentation level (e.g. 
metadata used by a specific implementation for round-tripping purposes 
comes to mind - consider that this sentence complete my action 446).

My point is that, while everything that is in the PS has to be in the 
XML, the reverse is not true; and, thus, that it might be better to 
derive the PS from the XML than the reverse (any "positioning" 
consideration apart).

And Jos did not convince me yet that I did not demonstrate that it was 
rather easily feasible :-)

Cheers,

Christian