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Subject: Re: [tm-pubsubj] Requirements oddity
Warning: longish! Peter, Finished up some more admin stuff this morning so back to the draft! Going slower than I hoped. :-( Peter Flynn wrote: > On Sat, 2003-09-13 at 14:35, Patrick Durusau wrote: > [...] > >>"A Published Subject Indicator may provide human-readable metadata about >>itself." >> >>But the "metadata" isn't really about "itself" is it? > > > I think what we were trying to say is that the PSind can have metadata > about itself *as well as* about the PSident (as you say). > > Well, that makes sense in a way, but may illustrate a lack of clarity in our thinking or the prose. Consider that I have the PSident: "http://psi.fruits.org/apple.html" // note change from committee spec Now, in order for that to be a Published Subject, it must "must resolve to an human-interpretable Published Subject Indicator." (Requirement 2) 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 1: URI? yes Requirement 2: Resolvable? yes Requirement 3: State its URI? yes Recommendation 1: human-readable metadata about itself? yes Recommendation 2: machine-interpretable metadata about itself? yes Recommendation 3. 1 and 2 are consistent? yes Recommentation 4. Declares itself a PSI? yes Recommendation 5: Declares its publisher? yes 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? Question 2: More specifically, is the date metadata about the Published Subject Indicator or about the Published Subject Identifier? 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> Question 3: Declare itself to be a PSI? Shouldn't it say Published Subject Indicator? It is obviously not a Published Subject Identifier. One problem I am wrestling with is how do machines discover information about Published Subject Identifiers? 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> (Does not have to use RDF, could declare a <link> element in XHTML and prepend dc. to all the same names inside meta elements.) 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?) 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. Comments? Hope everyone is having a great day! Patrick -- Patrick Durusau Director of Research and Development Society of Biblical Literature Patrick.Durusau@sbl-site.org Chair, V1 - Text Processing: Office and Publishing Systems Interface Co-Editor, ISO 13250, Topic Maps -- Reference Model Topic Maps: Human, not artificial, intelligence at work!
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