Re: [Eulermoz-developers] Re: N3ParserX.py question

[Jos D. <jos...@ag...>]

Guido, as we actually use it, [] just means _:x
i.e. a blank node.
What we use to express an inconsistency is for instance
{?A owl:equivalentClass owl:Nothing. ?X a ?A} => {}.

I also still think that we have to map the triple
  s p o.
to the binary predicate
  p(s, o).
as used in the actual ecmascript.

regards,
jos

-- 
Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/




naudts guido <nau...@ya...>
Sent by: eul...@li...
02/09/2004 12:51

 
        To:     ant...@4c..., eulermoz_dev 
<eul...@li...>
        cc:     (bcc: Jos De_Roo/AMDUS/MOR/Agfa-NV/BE/BAYER)
        Subject:        [Eulermoz-developers] Re: N3ParserX.py question


Hallo Antonio,
I indeed did not implement these parts of the
specification, as I did not find these features very
usefull except for []). See further my comments after
your text.
Now the specification I give in my source code is a
specification but there are others and there is really
no official spec (it should have to be made) so I try
to follow what Berners-Lee writes in his introduction
to N3.
See for specifications:
www.w3.org/DesignIssues/Notation3.html
I started also translating my parser to Javascript.
Are you doing the same thing? Or planning to do so?
Does it make sense that I make a translation?
If I do, I will add the missing features.
--- ant...@4c... wrote:

> Hallo Naudts.
>
> As you recommended to us we are on N3 parser in
> JavaScript (trying to work
> it out at least) and we are using your N3 parser as
> a guide.
>
> But there are a couple of questions  it would be
> nice if you give us a
> hint about how to use then and how they should be
> treated.
> Well it's just enough if you tell us where do you
> find this specification.
>
>
> a)Line 2046
> # verb ::= ">-" prop "->"    # has xxx of
> #       | "<-" prop "<-"    # is xxx of
>
I implemented the forms:
:s has :p of :o.
and
:s is :p of :o.
So I could easily implement also the ">-", "->",
"<-" and "<-" by treating them just the same but does
this add much? Well, for completeness sake I ought
have done it, but I never did.
> b)Line 2074
> # property_list ::= void   # to allow [...].
> #                | verb space+ object_list
> #                | verb space+ object_list space+
> ";" space+ property_list
> #                | ":-" anonnode  #to allow two
> anonymous forms to be
> given eg [ a :Truth; :- { :sky :color :blue } ] )
> #                | ":-" anonnode ";" property_list
> #                ;
>
I did not implement []. Still missing. [] is equal to
the false value; it comes today in place of
log:falseHood; I know Jos De Roo  uses it.(Correct me
Jos if I am wrong)
The ":-" is another feature of the specification which
I did not implement as I thought this to be totally
superfluous.For its meaning see:
http://infomesh.net/2002/notation3/
Cheers, Guido.
> Thanks.
> Cheers
> Antonio
>





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