From: David Carlisle <davidc@nag.co.uk>

Date: Wed, 15 Jun 2005 11:21:27 +0100

Message-Id: <200506151021.LAA00622@penguin.nag.co.uk>

To: maths@mathsonly.com, www-math@w3.org

Date: Wed, 15 Jun 2005 11:21:27 +0100

Message-Id: <200506151021.LAA00622@penguin.nag.co.uk>

To: maths@mathsonly.com, www-math@w3.org

Replying to my own post.. I wrote Such an extension mechanism would have been possible but wasn't the one chosen for MathML. It would have been more difficult for users to extend in this way and still have documents valid to a dtd or schema as the dtd would have to be extended each time a new mathematical function was added. In fairness I should add that despite the above comment, it is often more convenient to use an empty element. http://www.w3.org/TR/MathML/chapter5.html discusses both aproaches, adding a new rank construct both using ci and using a new empty element <mx:rank/> At NAG for example we document our library internally using an in-house dtd that uses a variant of MathML for mathematics markup. Its content mathematics part uses the structure of Content MathML but the set of empty elemsnts we use is completely different (as it's targetting a rather different area of mathematics). So for example The first section of the document that appears http://www.nag.co.uk/numeric/CL/manual/xhtml/s/s19abc.xml is marked up in our internal sources as <purpose-sec xid="purpose"> <p><thisroutine/> returns a value for the Kelvin function <maths> <apply> <bei/> <mi>x</mi> </apply> </maths>.</p> </purpose-sec> But this markup (including the extended MathML markup with <bei/> element) is only for in-house use. It is distributed as XHTML+(Presentation) MathML <h2><a name="purpose" id="purpose"/>1  Purpose</h2> <div class="paramtext">nag_kelvin_bei (s19abc) returns a value for the Kelvin function <math xmlns="http://www.w3.org/1998/Math/MathML"> <mrow><mi>bei</mi><mo>⁡</mo><mi>x</mi></mrow> </math>.</div> A fragment of our in house dtd.. <!ELEMENT apply ((%function;),(%nagpmathml;)+)> ... <!-- FUNCTIONS FOR USE AS FIRST CHILD OF APPLY --> <!ENTITY % function "abs|Ai|arc|arccos|arccosh|arcsin|arcsinh|arctan|arctanh|arg| bdi|bei|ber|Bi| cd|ci|Ci|cn|cond|cos|cosh|cot|coth|cov|covar|crit|cs| dc|det|dev|diag|dn|ds| erf|erfc|exp| Im|int|inv| kei|ker| lim|ln|log|logit| max|maximize|Maximize|mean|med|min|minimize|Minimize|mod| nc|nd|nint|ns| O| op| Prob| rank|Re| sc|sd|se|sech|Si|sign|sin|sinh|sn|span|sup| tan|tanh|trace| var|Var" > David ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________Received on Wednesday, 15 June 2005 10:22:34 UTC

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