support for displaying appropriate data types on DescribeFeatureType

[tomkralidis]

DescribeFeatureType always output items as XML type "string".

Some colleagues have asked if possible to output to be more indicative of the underlying datatype of the item.

Currently, one can define LAYER metadata "gml_item_type" to override the default. But this may be labourious for data with many items.

The root of this (I think) is in mapgml.c, function msWFSWriteElement and msWFSWriteConstantElement.

[tomkralidis]

Here are desired output examples:

GeoServer: ​http://vgisc.dwd.de/geoserver/wfs?service=WFS&version=1.1.0&request=DescribeFeatureType&typename=dwd:BUFR_TABLE_B_XIII

ESRI: ​http://geodata.epa.gov/wfsconnector/com.esri.wfs.Esrimap/NPL_FS?service=WFS&version=1.1.0&request=DescribeFeatureType

[dmorissette]

Tom, there is more to this than a few modifs to mapgml.c. I started looking at this a while ago in ticket #462 but never finished it.

I say it's definitely too late for 5.4 and could be considered for 6.0.

[dmorissette]

Closing as duplicate of #462