[mapserver-dev] ms rfc 48: adding a type keyword to the styleblock

[Tamas Szekeres]

2008/11/6 thomas bonfort <thomas.bonfort at gmail.com>:
> in my understanding, the geometryexpression keyword already applies to
> the geometry that mapserver is treating, i.e.
> GEOMETRYEXPRESSION "centroid"
> would be enough.
>
> do you see a use-case where an argument would be passed eg. to centroid() ?
>

Yes, when using nested functions for example:

GEOMETRYEXPRESSION "centroid(bbox([geom]))"

And we might also want to place the input into 2 or more locations in
the expression, like

 GEOMETRYEXPRESSION "difference(buffer([geom], 10), [geom])"

In this case denoting the input is quite inevitable.

Best regards,

Tamas