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Subject: RE: [tm-pubsubj] Requirements oddity
* Patrick Durusau: | So, lets construct the Published Subject Indicator, apple.html: | | <head> | <meta name="keywords" content="apple" /> | <meta name="location" content="http://psi.fruits.org/apple.html"; /> | <meta name="type" content="published subject indicator" /> | <meta name="publisher" content="Johnny Appleseed" /> | <meta name="date" content="20030914" /> | </head> | <body> | <p>Apple: Round firm fleshy fruit of a rosaceous tree</p> | </body> | | OK, do these two together meet the requirements and recommendations?: | | ... | | Requirement 3: State its URI? yes No. The string "http://psi.fruits.org/apple.html"; should appear in the body of the document, along with the compelling, human-readable indication of the identity of the subject" (i.e., the definition). | Recommendation 1: human-readable metadata about itself? yes No. The metadata about the subject indicator (in particular, the publisher and the date) is not human-readable, in my opinion. Techie-readable maybe (using View Source), but not human-readable :-) | Recommendation 2: machine-interpretable metadata about itself? yes Agreed. | Recommendation 3. 1 and 2 are consistent? yes Not as long as 1 does not exist :-) | Recommentation 4. Declares itself a PSI? yes No. Where does it say - in a human-readable form - that this resource is intended to be a (published) subject indicator? | Recommendation 5: Declares its publisher? yes But again, not in human-readable form. | Question 1: What in this HTML page is about the Published Subject | Indicator and which is about the Published Subject Identifier? Is there | a difference? In my opinion, it is all about the published subject indicator. Even the published subject identifier is metadata about the PSI (property type: location). | Question 2: More specifically, is the date metadata about the Published | Subject Indicator or about the Published Subject Identifier? The date is metadata about the subject indicator. | Would it make a difference if it read: | | <body> | <p>Apple: Round firm fleshy fruit of a rosaceous tree</p> | <p>Date: 20030914</p> | </body> Yes. Then at least *some* of the metadata would be human-readable. | Question 3: Declare itself to be a PSI? Shouldn't it say Published | Subject Indicator? It is obviously not a Published Subject Identifier. Yes, it should say so explicitly. | One problem I am wrestling with is how do machines discover information | about Published Subject Identifiers? Why do machines need information about the identifiers? Isn't it enough to *know* the identifier and have information about the (corresponding) subject indicator? | If the semantics of metadata in a Published Subject Indicator were | declared to be "about" the Published Subject Identifier, we could have: | | <rdf:RDF | xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"; | xmlns:dc="http://purl.org/dc/elements/1.1/"/> | <rdf:Description | rdf:about="http://psi.fruits.org/apple.html"; | dc:publisher="Johnny Appleseed" | dc:description="Apple: Round firm fleshy fruit of a rosaceous tree" | dc:type="Published Subject Indicator" | dc:date="2003-09-14" /> | </rdf:RDF> This is fine as it is ... except that dc:description is misplaced. You have provided a description of the subject itself, not of the subject indicator (or identifier). | Which not only meets all the requirements and recommendations but is | also machine-processable metadata "about" the Published Subject | Identifier. (Actually since we suggested consistency between | human/machine metadata, we could simply say it applies to both?) It meets the machine-readability recommendations, which are about metadata for the subject indicator (with the except of the dc:description property, as noted above). | While it is true that topic map processors will only "match" the | Published Subject Identifiers for subject identity purposes, making it | easy for other software to seek out and store metadata from Published | Subject Indicators "about" Published Subject Identifiers, looks like a | good strategy. I still don't understand why software needs metadata about identifiers rather than indicators. We *do* need ways for software to "seek out" PSIs in general, but that's another story... Steve -- Steve Pepper <pepper@ontopia.net> Chief Executive Officer, Ontopia Convenor, ISO/IEC JTC 1/SC 34/WG 3 Editor, XTM (XML Topic Maps 1.0)
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