[postgis-devel] Math expressions in documentation

[Obe, Regina]

Kevin,

not that it matters - I had a typo in my message to you.  I'm running
OpenSUSE 10.3  not OpenSolaris.

Thanks,
Regina 

-----Original Message-----
From: postgis-devel-bounces at postgis.refractions.net
[mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of
Kevin Neufeld
Sent: Friday, August 01, 2008 11:33 AM
To: PostGIS Development Discussion
Subject: [postgis-devel] Math expressions in documentation

Hi folks,

I seem to be having a little trouble with the math expressions in the 
documentation.  In ST_Crosses 
(http://postgis.refractions.net/documentation/manual-svn/ST_Crosses.html
) 
and ST_Touches, I added the mathematical expressions straight out of the

OGC specifications as gif images.  I mucked around with MathML for a 
while, trying to get that to work with Docbook ... gave up and resorted 
to using simple HTML characters (which don't seem to render properly 
some versions of IE and Firefox, as well as different build environments

- it breaks on Regina's Solaris box, but builds fine on my Fedora box)

In particular, this won't work:

<para>
   <equation>a.Crosses(b) ⇔ (dim(I(a) ∩ I(b)) < 
max(dim(I(a)),dim(I(b))) ∧ (a ∪ b ≠ a) ∧ (a ∪ b ≠ 
b)</equation>
</para>

Any suggestions?  Does anyone have experience with MathML?  It's really 
rather simple, but my Fedora box takes forever loading the MathML DTD. 
Or should we simply just leave them as images?

Cheers,
Kevin
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