---------- Forwarded message ---------- From: Tim Berners-Lee timbl@w3.org Date: Fri, Jan 7, 2011 at 10:47 AM Subject: Re: Is it best practices to use a rdfs:seeAlso link to a potentially multimegabyte PDF?, existing predicate for linking to PDF? To: Peter DeVries pete.devries@gmail.com Cc: public-lod@w3.org

Certainly. the tabulator follows rdfs:seeAlso and expects some terse RDF. and so would be crippled by any large file, and PDF would not of course help it at all. I take seeAlso as a fairly strong request to see the other thing, like an HTTP redirect. Not a generic "this is vaguely related" link at all, and not in general to point to human-readable stuff.

Tim

On 2011-01 -06, at 14:40, Peter DeVries wrote:

I was wondering if there is an existing predicate for linking to a PDF file?

I would like to incorporate a link between bibliographic reference description and a URL to the location of a PDF of that document.

I had minted a predicate txn:hasPDFVersion, as demonstrated in this RDF snippet. (Part of http://lod.taxonconcept.org/ses/v6n7p.rdf )

<txn:SpeciesOriginalDescription rdf:about=" http://lod.taxonconcept.org/ses/v6n7p#OriginalDescription%22%3E <!-- Ideally, this should link to a resource in the Biodiversity Heritage Library --> dcterms:titleOriginal Published Description relating to Species Concept Puma concolor se:v6n7p</dcterms:title> dcterms:identifier http://lod.taxonconcept.org/ses/v6n7p#OriginalDescription </dcterms:identifier> dcterms:descriptionLOD metadata about the original species description relating to Species Concept Puma concolor se:v6n7p</dcterms:description> <dcterms:isPartOf rdf:resource=" http://lod.taxonconcept.org/ses/v6n7p#Species%22/%3E <txn:hasAuthorURI rdf:resource=" http://dbpedia.org/resource/Carl_Linnaeus%22/%3E txn:hasBasionymNameFelis concolor Linnaeus 1771</txn:hasBasionymName> txn:year1771</txn:year> <txn:hasPDFVersion rdf:resource=" http://assets.geospecies.org/spec_concept_uuid/603bebac-cc44-4168-bbf7-b11b9... "/> <txn:speciesOriginalDescriptionHasSpeciesConcept rdf:resource=" http://lod.taxonconcept.org/ses/v6n7p#Species%22/%3E <!-- There should be a type specimen. Add link to GBIF via 'txn:sodHasTypeSpecimen' if they know about it. --> <wdrs:describedBy rdf:resource=" http://lod.taxonconcept.org/ses/v6n7p.rdf%22/%3E </txn:SpeciesOriginalDescription>

Some have suggested using rdfs:seeAlso to link to what could be a multimegabyte PDF, but I think this would cause problems for a number of RDF crawlers like Elmo.

In summary, I think it would be useful to have a predicate that can be used for linking specifically to a PDF document.

Is there an existing predicate for this?

What do people think about the suggestion to use rdfs:seeAlso to link to a PDF?

I would also like to know of others thoughts or suggestions regarding this issue,

Respectfully,

- Pete

--------------------------------------------------------------- Pete DeVries Department of Entomology University of Wisconsin - Madison 445 Russell Laboratories 1630 Linden Drive Madison, WI 53706 TaxonConcept Knowledge Base http://www.taxonconcept.org/ / GeoSpecies Knowledge Base http://lod.geospecies.org/ About the GeoSpecies Knowledge Base http://about.geospecies.org/ ------------------------------------------------------------