Re: html design questions

I wrote this code, but it was a very long time ago.  The use of  
substructures
was to structure the name space.  The use of refs was probably a way  
to make
testing equality fast, but I suspect was unnecessary.  If I were to  
do it again,
I'd just use the Atom.atom type for the attributes.

	- John

P.S. I've been working on a library for 3d graphics in SML (right now  
it only
works on MLton, but I hope to port it to SML/NJ eventually).  I've  
written a
loader for obj files, but I'm interested in seeing your code when it  
is finished.

On Apr 9, 2007, at 10:49 PM, brian wrote:

> I am working on an x3d/vrml97 module very similar, as you can
> imagine, to the HTML module found in the smlnj-lib.
>
> I was looking at the module and had some sml questions about it:
>
> I've noticed a lot of this sort of thing:
>
>      structure CellVAlign =
>        struct
> 	type align = string ref
> 	val top = ref "TOP"
> 	val middle = ref "MIDDLE"
> 	val bottom = ref "BOTTOM"
> 	val baseline = ref "BASELINE"
> 	fun toString (ref s) = s
> 	val fromString = match [top, middle, bottom, baseline]
>        end
>
> Why are the vals assiged to sting ref instead of just a string ?
>
> I'm also not clear on the point of using a structure.  Why not just
> use a type:
>
> type CellVAlign = string
>
> ?
>
> In any case a big thanks to whoever wrote it.  It's going to be very
> helpful !
>
> Thanks
>
> Brian
>
>
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