Mapserver outputs invalid GML if layer name starts with number

[wbronsema@…]

If a layer name starts with a number, the GML output from something like a
getfeature request is invalid GML.

Steps to reproduce:
1) Create a WFS layer called "123_test".
2) Execute a getfeature request and view the GML.
3) Look for tag entries of <123_test>.

No errors occur, but it is against XML specifications to start a tag with a number.

[dmorissette]

The following actions should be taken:

1- Document the fact that layer names must start with a letter when setting up a
WMS or WFS server (in the WMS server howto and WFS server howto)

2- Produce a warning in GetCapabilities (both WMS and WFS) if a layer name is
invalid

3- Produce an exception if a GetFeature or GetFeatureInfo is ever performed on a
layer with an invalid name

[assefa]

This is similar to bug 486.

Send warning in the capabilities wms/wfs document for "invalid" layer names.

There are also warning in the gml docuemtn for example for invalid xml tags. I 
think it should be enough.

Valid layer names should be mentionned in the wms/wfs docs (layer names should 
not start with a digit or have spaces in them). Reassign to Jeff.

[jmckenna@…]

wms and wfs server docs now include a warning about this layer name rule.
comitted to cvs.