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Re: linked open data and PDF

From: Martynas Jusevičius <martynas@graphity.org>
Date: Sat, 24 Jan 2015 13:27:44 +0100
Message-ID: <CAE35VmzTAifTm4Msu4a91r0x7ARC6gUjFRXZM0VE9J_w=f1WSw@mail.gmail.com>
To: Larry Masinter <masinter@adobe.com>
Cc: Michael Brunnbauer <brunni@netestate.de>, Alfredo Serafini <seralf@gmail.com>, Paul Houle <ontology2@gmail.com>, "public-lod@w3.org" <public-lod@w3.org>
rdsf:seeAlso and owl:sameAs values in your example are literals, not resources.

On Sat, Jan 24, 2015 at 12:03 AM, Larry Masinter <masinter@adobe.com> wrote:
> I wrote:
>> > Image formats like JPEG and PNG (for which there
>> > is support for XMP) don't have a standard, uniform
>> > way of attaching other files, though, so allowing
>> > data (or a pointer to external data) in the XMP
>> > would broaden the applicability.
>
> And Michael Brunnbauer replied:
>  > I am right that such a pointer to external data would have to be a literal?
>> The way I read the XMP standard is that only literals, blank nodes,   rdf:Bag and rdf:Seq are allowed as object of a triple.
>
> No, URI is allowed as a simple type in XMP, so I think all you need is a Linked Data schema.
> But XMP uses rdf:Bag with named components to hold structures, and the ResourceRef structure can be used to link documents by the InstanceID GUID as well as file location (ManageFrom).
>
>
> http://www.adobe.com/content/dam/Adobe/en/devnet/xmp/pdfs/DynamicMediaXMPPartnerGuide.pdf has some examples.
>
>> This would rule out standard options like:
>>
>>   <this_document> rdfs:seealso <rdf_document_about_pdf_document>
>>   <this_document> owl:sameAs <pdf_document_uri>
>>
>> Which would enable agents to find and regognize RDF data about the
>> document.
>
>       <rdf:Description rdf:about=""
>             xmlns:pdf="http://ns.adobe.com/pdf/1.3/"
>             xmlns:xmp="http://ns.adobe.com/xap/1.0/"
>             xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
>             xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
>             xmlns:owl_1_="http://www.w3.org/2002/07/owl#"
>             xmlns:dc="http://purl.org/dc/elements/1.1/">
>          <pdf:Producer>Microsoft® Excel® 2013</pdf:Producer>
>          <xmp:CreatorTool>Microsoft® Excel® 2013</xmp:CreatorTool>
>          <xmp:CreateDate>2015-01-21T09:26:54-08:00</xmp:CreateDate>
>          <xmp:ModifyDate>2015-01-23T14:55:44-08:00</xmp:ModifyDate>
>          <xmp:MetadataDate>2015-01-23T14:55:44-08:00</xmp:MetadataDate>
>          <xmpMM:DocumentID>uuid:895A48D2-1F07-442F-A374-FB045D560C9B</xmpMM:DocumentID>
>          <xmpMM:InstanceID>uuid:a3962424-bf4c-4e33-8475-013b5ad35ace</xmpMM:InstanceID>
>          <rdfs:seealso>http://example.org/rdf-document</rdfs:seealso>
>          <owl_1_:sameAs>http://5stardata.info/gtd-5.html</owl_1_:sameAs>
>          <dc:format>application/pdf</dc:format>
>          <dc:title>
>
>
>
Received on Saturday, 24 January 2015 12:28:12 UTC

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