From: Christoph LANGE <ch.lange@jacobs-university.de>

Date: Mon, 1 Feb 2010 17:59:35 +0100

To: "www-math@w3.org" <www-math@w3.org>

Message-Id: <201002011759.40915.ch.lange@jacobs-university.de>

Date: Mon, 1 Feb 2010 17:59:35 +0100

To: "www-math@w3.org" <www-math@w3.org>

Message-Id: <201002011759.40915.ch.lange@jacobs-university.de>

Dear all, given that RDFa has been a recommendation since 2008, have you ever thought of using RDFa inside Presentation MathML as an alternative for Content MathML? Here is an example how this might look. I'm literally reusing parts of Content MathML as the vocabulary for RDF (inspired by the approach suggested by M. Marchiori in http://www.w3.org/People/Massimo/papers/2003/mathsemweb_mkm_03.pdf but then never adopted), but one could also design a proper ontology from scratch. And I'm using empty mrows for carrying annotations that do not fit elsewhere: <mrow typeof="math:apply"> <mrow rel="rdf:_1"> <!-- first argument --> <mn typeof="math:cn" property="rdf:value" datatype="xsd:integer">1</mn> </mrow> <mrow rel="math:head"> <!-- head element of the expression, i.e. the one that would be the first child of <apply/> --> <mo resource="http://www.openmath.org/cd/arith1#plus">+</mo> </mrow> <mrow rel="rdf:_2"> <!-- second argument --> <mi typeof="math:ci" property="rdf:value" datatype="xsd:string">x</mi> </mrow> </mrow> I'm not actually _propagating_ such a syntax, so don't get me wrong. Parallel MathML markup is easier to read and write, probably more adequate to the tree structure of mathematical formulæ, and compatible to OpenMath, which is important for computation. But supporting RDFa in MathML would give us access to _other_ kinds of software, now that RDFa in XHTML is becoming more and more widely used. Consider semantic search engines, which crawl the web and, e.g., index all occurrences of a certain URI – http://xmlns.com/foaf/0.1/Person as well as http://www.openmath.org/cd/arith1#plus. So what I'm just interested in is: Have there ever been any such thoughts? Cheers, Christoph -- Christoph Lange, Jacobs Univ. Bremen, http://kwarc.info/clange, Skype duke4701Received on Monday, 1 February 2010 16:59:54 GMT

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