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  • Tim: What triples should tabulator assert?
  • JAR: When is an HTTP interaction inconsistent with some assertions? (e.g. 200)
  • Alan: IRI canonicalization / comparison? (POWDER)
  • Alan: Nuanced distinctions for things on the web. Form vs. blog vs. survey vs. etc.


  • Requirements gathering
    • IRs do not have physical properties such as mass.
    • Numbers and representations are not IRs.
    • Web pages, generally speaking, are IRs.
    • Every HREF link to a web page should be upgradeable to a triple.
  • Ground in RDF and OWL semantics
  • Ontology development
    • Relate to other ontologies
      • FRBR
      • OBO Information Artifact Ontology

David: "IR discussions have been unproductive. Talking about identity is the way to make progress."


  • IRs do not have physical properties such as mass.
  • Avoid using "resource". Say "thing" or "information resource".
  • Avoid the word "endpoint".

IR concepts:

  • Abstract document (generic or fixed)
  • Variable document
  • Function from (request, time) to response
  • Sequence of bits, with mime type


  • Why do we care about IR vs. non-IR, anyhow?
  • Are all IRs abstract documents?
  • Are PDF documents IRs? (Tim: yes, "fixed resource")
  • Can an abstract document contain a misspelling?
  • How might an IR, as independently specified by some RDF, relate to what a web apparatus does?
  • If server behavior at two URIs is identical, and includes 200s, do the URIs name the same IR? (Tim 4/15: not necessarily)
  • If server behavior for two URIs is different, but both include 200s, can they possibly name the same IR? (Tim 4/15: yes)
  • Is the AWWW IR definition salvageable? (DBooth, JAR: no.)
  • Is the information named, or is something related to it?

Edge cases:

  • What about badly behaved 200-responders - are they IRs or server errors?
    • "Badly behaved" meand they don't give the appearance of being "abstract documents".
      • Example: random responders.
      • Example: language or format variants say inconsistent things.
  • (What would it mean should one link to one of these?)
  • When does a URI come to denote a different IR (e.g. parked domains / change of ownership)?