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Re: earl location pointer methods

From: Shadi Abou-Zahra <shadi@w3.org>
Date: Wed, 16 Aug 2006 14:27:46 +0200
Message-ID: <44E30F42.9060503@w3.org>
To: Jim Ley <jim@jibbering.com>, public-wai-ert@w3.org

Thanks for working on this Jim. I have some questions for todays discussion:

1. Are both properties "earl:instance-of-pointer" and "earl:pointerCollection" needed? Since the class earl:PointerCollection is a sub-class of earl:Pointer, could something like this work:

 <rdf:Property rdf:about="http://www.w3.org/WAI/ER/EARL/nmg-strawman#subpointer">
    <rdfs:label xml:lang="en">sub pointer</rdfs:label>
    <rdfs:comment xml:lang="en">An instance of a pointer in another pointer.</rdfs:comment>
    <rdfs:domain rdf:resource="http://www.w3.org/WAI/ER/EARL/nmg-strawman#Pointer"/>
    <rdfs:range rdf:resource="http://www.w3.org/WAI/ER/EARL/nmg-strawman#Pointer"/>

2. How about having separate earl:byteSnippet and earl:charSnippet classes? I agree the schema would be slightly more verbose but also more comprehensible and less ambiguous (for example the usage of the properties is not apparent from the schema). The schema for the proposed earl:Snippets is attached.

3. I'm not sure I understand the use for the earl:Offset class. It has earl:charOffset and earl:byteOffset properties but is not used by anything. Is this supposed to be a standalone pointer too?


Jim Ley wrote:
> "Shadi Abou-Zahra" <shadi@w3.org>
>> I'm OK without having these pointers be subclasses of a generic 
>> pointer class because I agree it adds a lot of overhead with little 
>> value. However,
>> I think it may be good to introduce a generic pointer class so that 
>> the core pointers can be extended with other types of pointers we are 
>> currently
>> not thinking of.
> added an Earl:Pointer class.
> Added range and domain for all.
> Attached is the rdfs and an example file
> Cheers,
> Jim.

Shadi Abou-Zahra     Web Accessibility Specialist for Europe | 
Chair & Staff Contact for the Evaluation and Repair Tools WG | 
World Wide Web Consortium (W3C)           http://www.w3.org/ | 
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Received on Wednesday, 16 August 2006 12:27:55 UTC

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