---------- 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">

   
   <dcterms:title>Original Published Description relating to Species Concept Puma concolor se:v6n7p</dcterms:title>

   <dcterms:identifier>http://lod.taxonconcept.org/ses/v6n7p#OriginalDescription</dcterms:identifier>

   <dcterms:description>LOD 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"/>

   <txn:hasAuthorURI rdf:resource="http://dbpedia.org/resource/Carl_Linnaeus"/>

   <txn:hasBasionymName>Felis concolor Linnaeus 1771</txn:hasBasionymName>
   <txn:year>1771</txn:year>

   <txn:hasPDFVersion rdf:resource="http://assets.geospecies.org/spec_concept_uuid/603bebac-cc44-4168-bbf7-b11b976f9d79/Felis_concolor_Linnaeus_1771.pdf"/>

   <txn:speciesOriginalDescriptionHasSpeciesConcept rdf:resource="http://lod.taxonconcept.org/ses/v6n7p#Species"/>

   

   <wdrs:describedBy rdf:resource="http://lod.taxonconcept.org/ses/v6n7p.rdf"/>

  </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 / GeoSpecies Knowledge Base
About the GeoSpecies Knowledge Base
------------------------------------------------------------