From: Neil Soiffer <NeilS@dessci.com>

Date: Thu, 31 Jul 2003 09:40:53 -0700

Message-ID: <026f01c35782$82d57ca0$6601a8c0@raindrops>

To: "Robert Miner" <RobertM@dessci.com>, <jpederse@wiley.com>

Cc: <www-math@w3.org>

Date: Thu, 31 Jul 2003 09:40:53 -0700

Message-ID: <026f01c35782$82d57ca0$6601a8c0@raindrops>

To: "Robert Miner" <RobertM@dessci.com>, <jpederse@wiley.com>

Cc: <www-math@w3.org>

----- Original Message ----- From: "Robert Miner" <RobertM@dessci.com> To: <jpederse@wiley.com> Cc: <www-math@w3.org> Sent: Thursday, July 31, 2003 9:04 AM Subject: Re: cancelling fractions > > > Hi. > > > I have a related question: what is the correct way in MathML to tag > > "crossed out" parts of fractions, used to indicate terms that have been > > cancelled? If it is a single letter or number, then the combining solidus > > U+0338 would do the trick, but is there a way to indicate a line through a > > whole expression? Should I use > > <mrow>...the expression...</mrow><mo>̶</mo> ? > > This won't work properly in MathPlayer. I haven't tried Mozilla. Doesn't work in Mozilla 1.4. One problem with using solidus or other characters is that you don't have control over vertical or horizontal positioning. > > My own preference would be to use the <menclose> construct. I have > long thought this is really the right way to do strikeouts, since it > is more in line with the MathML philosophy of explicitly binding > operators to expressions: > > <menclose notation="NESWslash"> > <mrow> ... the expression ... </mrow> > </menclose> > > I haven't thought about the right collection of values for the > notation attribute, but you would obviously want NESW and NWSE > slashes. > > If this is very important to you, I might be able to slip it into the > current MathPlayer development cycle still. I would be very > interested to hear what the rest of the list thinks of this as well. > > --Robert <menclose> or a new construct such as <moverstrike> would be the way to do it if we were talking about an addition to MathML, but that is not an option at the present. Hence, I don't think your suggestion is a good one since it means writing invalid MathML. Perhaps a private namespace a new attribute to menclose that would be understood by MathPlayer would be better. I don't think that there is any solution that will work with existing browsers. However, as Robert said, if it very important, I'm sure we can come up with a legal solution that at least works in the next version of MathPlayer. Neil Soiffer email: neils@dessci.com Senior Scientist phone: 562-433-0685 Design Science, Inc. http://www.dessci.com "How Science Communicates" MathType, WebEQ, MathPlayer, Equation Editor, TeXaideReceived on Thursday, 31 July 2003 12:40:55 GMT

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