[postgis-devel] Math expressions in documentation

[Kevin Neufeld]

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