- From: Larry Masinter <masinter@adobe.com>
- Date: Fri, 23 Jan 2015 23:03:40 +0000
- To: Michael Brunnbauer <brunni@netestate.de>
- CC: Martynas Jusevi??ius <martynas@graphity.org>, Alfredo Serafini <seralf@gmail.com>, Paul Houle <ontology2@gmail.com>, "public-lod@w3.org" <public-lod@w3.org>
- Message-ID: <DM2PR0201MB096013CD9F2A630ABED45BFAC3360@DM2PR0201MB0960.namprd02.prod.outlook.>
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>
Attachments
- application/pdf attachment: gtd-2-excel-add-owl.pdf
Received on Friday, 23 January 2015 23:04:10 UTC