From: Karl Tomlinson <w3@karlt.net>

Date: Mon, 30 Jun 2008 10:52:39 +1200

To: <www-math@w3.org>

Cc: "Robert Miner" <robertm@dessci.com>, Justus-bulk@Piater.name, <dev-tech-mathml@lists.mozilla.org>

Message-ID: <871w2f26rs.fsf_-_@blackhawk.home>

Date: Mon, 30 Jun 2008 10:52:39 +1200

To: <www-math@w3.org>

Cc: "Robert Miner" <robertm@dessci.com>, Justus-bulk@Piater.name, <dev-tech-mathml@lists.mozilla.org>

Message-ID: <871w2f26rs.fsf_-_@blackhawk.home>

On Fri, 27 Jun 2008 07:59:34 -0700, Robert Miner wrote: > All renderers that take on the problem have to special > case their layout algorithms, and look for isolated pseudoscripts in the > superscript position (or presuperscript position). By isolated, I mean > that there are no other characters in the same token element with the > pseudoscript, so that <msup> <mi>x</mi> <mo>′!</mo> </msup> or > whatever is not special-cased. I'm trying to think of the best (perhaps easiest) way to detect these special cases, while maintaining expected behavior for the following: > At the same time, clearly the data model for all MathML token elements > is Unicode CDATA, so one cannot rule out the possibility of valid MathML > markup containing constructions such as <mi>x′</mi> or even > <mi>x</mi><mo>′</mo>. So that has to work as expected too. Justus-bulk@Piater.name writes: > But what is "expected" here? If such markup is expected to yield > superscript appearance, then one might use the original glyph at zero > script level, I imagine the author expects presentation similar to the normal rendering of the Unicode characters, as you suggest. > but this heuristic breaks down with nested/chained superscripts. Wouldn't nested superscripts necessitate the use of msup, etc.? What is the appropriate markup for multiple pseudoscript characters within one superscript level? I would have considered the characters to be separate operators and so <msup> <mi>x</mi> <mrow> <mo>′</mo> <mo>′</mo> <mo>′</mo> </mrow> </msup> which makes special case detection based on infix (rather than postfix) form impossible. But at http://www.w3.org/Math/testsuite/mml2-testsuite/Topics/Primes/primes1.xml a single operator containing multiple characters is used: <msup> <mi> x </mi> <mo> '' </mo> </msup>Received on Sunday, 29 June 2008 22:53:41 GMT

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