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Re: LDPR binaries in spec

From: Sergio Fernández <sergio.fernandez@salzburgresearch.at>
Date: Wed, 19 Dec 2012 15:56:28 +0100
Message-ID: <50D1D59C.5080800@salzburgresearch.at>
To: Henry Story <henry.story@bblfish.net>
CC: public-ldp-wg@w3.org
Hi Henry,

the Linked Media Principles should be relevant to ISSUE-15 regarding 
where is called "content" there:

http://code.google.com/p/lmf/wiki/PrinciplesLinkedMedia

Best,
Sergio

On 19/12/12 11:45, Henry Story wrote:
> There are a few paragraphs in the current spec ( http://www.w3.org/2012/ldp/hg/ldp.html )
> which seem to need a bit of clarification, relating to ISSUE-15 probably. I am just noting
> it here, as I am thinking about this right now, and noticed these.
> It is also related to use cases 4.8 and 4.8.1 of the UCR
>   http://www.w3.org/2012/ldp/hg/ldp-ucr.html#uc-manage_media_resources
>
>
> Definition:
> [[
> Linked Data Platform Resource (LDPR)
> HTTP resource that conforms to the simple lifecycle patterns and conventions in this document.
> ]]
>
> So presumably resources that can be created in a collection and that get deleted
> when a collection gets deleted. If we add images to a collection, are they then LDPRs?
>
> [[
> 4.1.3 LDPR servers may host a mixture of LDPRs and non-LDPRs. For example, it is common for LDPR servers to need to host binary or text resources that do not have useful RDF representations.
> ]]
>
> This seems to suggest that LDPRs cannot be binaries.
>
> [[
>   4.2.2 LDPR servers must provide an text/turtle representation of the requested LDPR.
> ]]
>
> If one were to create a picture, would this say that one MUST return turtle for it by default?
> That would not be completely silly it could be a representation of the picture that said
> something like:
>
> ------------------------------
>   @prefix iana:<http://www.iana.org/assignments/relation/>  .
>   @prefifx foaf<http://xmlns.com/foaf/0.1/>  .
>   @prefix awol:<http://bblfish.net/work/atom-owl/2006-06-06/#>  .
>
>    <>  a foaf:Picture;
>      foaf:depicts joe, jack, jane;
>      iana:alternate<image.jpg>,<image.gif>  .
>
>    <image.jpg>  awol:type "image/jpeg" .
>    <image.gif>  awol:type "image/gif" .
> --------------------------------
>
> But that still leaves the question what happens if one GETs<image.jpg>
> without an image/* mime type. Does one get a redirect to the previous
> metadata file served as Turtle? Or does the server just return the image?
>
> And if one deletes the collection, does<image.jpg>  not also get deleted?
>
> Henry
>
> A short message from my sponsors: Vive la France!
> Social Web Architect
> http://bblfish.net/
>

-- 
Sergio Fernández
Salzburg Research
+43 662 2288 318
Jakob-Haringer Strasse 5/II
A-5020 Salzburg (Austria)
http://www.salzburgresearch.at
Received on Wednesday, 19 December 2012 14:57:12 UTC

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