Re: Annotations, Module References and Local Names

Dear Carlos,

Carlos Damasio wrote on 28 September 2009:
> 
> I believe that the FLD document does not specify completely the the 
> combination of annotations with remote formulas.
> First, it is possible to write
> 
> (* _xpto *) _a() @ _univ(1) @ _univ(2)
> 
> According to the specification the annotation refers to the whole 
> formula _a() @ _univ(1) @ _univ(2), but in section 4.2.2 this case is 
> absent.
> So, I understand this as the annotation is referring  to the inner 
> _a(). Is this the intent?
 
Thank you for pointing out the omission of this case in the 
presentation-to-XML mapping in Section 4.2.2. This oversight has now been 
corrected. Regarding the question of whether (* _xpto *) refers to _a() or 
to _a() @ _univ(1), both parsings are possible. Note that the presentation 
syntax is abstract and no attempt has been made to define precedence 
rules. In XML, however, ambiguity does not arise.

> Furthermore, notice that it is also syntactically correct  the fragment:
> 
> (* _xpto1 *) (* _xpto2 *) (* _xpto3 *) _a() @ _univ(1) @ _univ(2)
> 
> How is this handled, since <Remote> does not allow meta information? 
> Should it be discarded?
 
As mentioned, the oversight of dropped meta information from the <Remote> 
tag has been corrected. So this is no longer an issue. The above 
expression happens to parse unambiguously as (* _xpto1 *) ((* _xpto2 *) 
((* _xpto3 *) _a()) @ _univ(1)) @ _univ(2). The annotation given in (* 
_xpto3 *) will be inside <Atom>...</Atom> and the other two annotations 
will be inside <Remote>...</Remote>.

> Moreover, notice that I have been using local names with "_" before, 
> as specified by the grammar (this is not done in Example 4 of RIF-FLD).
> This is very unpleasant and unnecessary since the initial "_" can be 
> removed without creating ambiguity in the Grammar. Otherwise, please 
> correct Example 4 of RIF-FLD.

There was a typo in which Course appeared by itself in that example. It 
has been changed to u:Course. The symbol Course was not intended to be 
local. Do you see any other typos of this kind?

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Best regards,

RIF WG 

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Christian de Sainte Marie

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