Should WMS require PROJ.4?

[Kralidis,Tom [Burlington]]

> 
> > Is LatLongBoundingBox a required element in WMS capabilities 
> > documents?
> >

LatLongBoundingBox is an optional element in OGC:WMS 1.1.1:

http://schemas.opengeospatial.net/wms/1.1.1/capabilities_1_1_1.dtd

Additionally, there is an optional BoundingBox child element in Layer,
which specifies the bbox in the native projection of the data, i.e.:

<LatLonBoundingBox minx="-84.9772" miny="40.5156" maxx="-82.2389"
maxy="44.4664"/>
<BoundingBox SRS="EPSG:26717" minx="183289" miny="4.4915e+06"
maxx="395129" maxy="4.9243e+06"/>

While both are not required in OGC:WMS Capabilities XML, they provide
much functionality to Capabilities parsers.  Some uses are:

- generating an overview map with a bounding box outline of the Layer
- generating an OGC:WMS GetMap request of the data
- provides "Zoom to layer" type functionality to WMS clients

Add the fact that MapServer generates this beautifully on the fly for
Capabilities.

..Tom