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Re: review of rdf:text, dated 2008-11-04

From: Jos de Bruijn <debruijn@inf.unibz.it>
Date: Thu, 06 Nov 2008 19:49:12 +0100
Message-ID: <49133C28.6090408@inf.unibz.it>
To: Sandro Hawke <sandro@w3.org>
CC: RIF WG <public-rif-wg@w3.org>


Sandro Hawke wrote:
>> I reviewed the current draft of the rdf:text specification [1].
> 
> Excellent, thank you.
> 
> Can you please send this to public-rdf-text@w3.org instead of or in
> addition to public-rif-wg, so the interested OWL participants can join
> the discussion?
> 
> A reminder: people should subscribe to that list if they are interested
> in this document.  See
>      http://lists.w3.org/Archives/Public/public-rdf-text/
> for archives and the "subscribe" link.
>    
> Note that yesterday, OWL-WG resolved to publish this as a FPWD as soon
> as RIF-WG approves, so we'll have to figure out which changes to make
> before/after publication.

I would be fine if my main concerns are just marked with an editor's
note saying that the issues are under discussion.

Best, Jos

> 
>        -- Sandro
> 
>> I subdivided my comments into criticism on the content, criticism on the
>> structure, errors in the document, and editorial issues.
>>
>> Criticism on the content
>> ====
>> - to assure maximum compatibility with current and future versions of
>> XML schema datatypes, the string parts of both the lexical and value
>> space should be based on the respective spaces of the XML schema
>> datatype string.
>> - the set of characters is finite, and thus it cannot be assumed that it
>> is infinite. The problem that some OWL 2 implementations might have some
>> issue with the finiteness of this set is of no concern to this datatype
>> per se. In fact, the XML schema string datatype is based on a finite set
>> of characters, and so OWL 2 implementations will run into problems with
>> this datatype.
>> If there is really a problem to be expected with implementations of OWL
>> 2, it should be dealt with in the OWL 2 specification, and not the
>> specification of this datatype.
>> - concerning the definition of fn:text-length: It is not obvious that
>> this function should return the length of only the string part of the
>> text. A user might expect the language tag, and perhaps even the
>> separator used in the lexical space, to be taken into account when
>> computing the length.
>> Therefore, I believe no text-length function should be provided.
>>
>> Criticism on the structure
>> ====
>> - the sections 3.1 and 3.2 are not logically part of the definition of
>> the data type, and so should not be included in section 3.
>>
>> Errors in the document
>> ====
>> - In the example in section 3.2 it is claimed that the string "Padre de
>> familia" is mapped to the same value as the text "Padre de familia@".
>> This is clearly not true.
>> - In the definition of text-from-string-lang, $arg2 must be a string as
>> specified in BCP 47, and otherwise an error must be raised.
>>
>> Editorial issues
>> ====
>> - abstract: "both in" => "in both"
>> - introduction: the text about how this document came to be and about
>> the collaboration between the working groups might be interesting for
>> the "purpose of this document" section, but not for the specification
>> document itself. However, I guess that for the first public working
>> draft it's not really an issue.
>> - the references of the form [1],... are awkward. Please use the same
>> style for all references.
>> - some of the references are italicized, and some are not, e.g., the
>> second sentence of section 2.
>> - sections 4.1.3 and 4.1.4: please specify the return values; extraction
>> is a process.
>> - the text and summaries in sections 4.2.1 and 4.2.2 is not entirely
>> clear. Please use symbols for referring to the individual parts of the
>> arguments and to state properties about them, like in sections 4.1.3 and
>> 4.1.4.
>> - there is a question-mark in the signature declaration in section
>> 4.3.2. It is not clear what this means.
>>
>>
>> [1] http://www.w3.org/2007/OWL/draft/ED-owl2-rdf-text-20081104/
>>
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>> --------------ms080304090806080809060301--
> 

-- 
Jos de Bruijn            debruijn@inf.unibz.it
+390471016224         http://www.debruijn.net/
----------------------------------------------
No one who cannot rejoice in the discovery of
his own mistakes deserves to be called a
scholar.
  - Donald Foster


Received on Thursday, 6 November 2008 18:56:33 GMT

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