[Mapserver-dev] OWS metadata and LegendURL clarification

[Paul Spencer]

Tom ... comment below ...

Kralidis,Tom [Burlington] wrote:
> Hi,
> 
> First off, I'd like to thank Julien and Assefa for their work in
> implementing msOWSPrintURLType() (bug 944)into CVS and LegendURL (bug
> 1001).  This will enable richer output for OGC metadata in Capabilities,
> as well as streamlining the way URLs are formatted.  This will be a big
> benefit for the catalogs and registries out there who harvest OGC Web
> Services for discovery.
> 
> As a result, mapfiles can now define:
> 
> "wms_dataurl_format"
> "wms_dataurl_type"
> "wms_dataurl_href"
> 
> "wms_metadataurl_format"
> "wms_metadataurl_type"
> "wms_metadataurl_href"
> 
> "wfs_metadataurl_format"
> "wfs_metadataurl_type"
> "wfs_metadataurl_href"
> 
> Question:
> 
> will the generic ows_* directives be implemented for WMS and WFS, as
> they were for WCS, in time for 4.4.0?
> 
> For Legends (bug 262, which was solved by bug 944):
> 
> wms_style    =>  name of the style
> wms_style_<style's_name>_legendurl_href
> wms_style_<style's_name>_legendurl_format
> wms_style_<style's_name>_legendurl_width
> wms_style_<style's_name>_legendurl_height
> 
> Question:
> 
> The issue I have with this is that someone has to explicitly define this
> in the mapfile.  AFAIK, MapServer doesn't support multiple styles in WMS
> for layers, so we always default to one style.

this is implemented to support *other* wms servers that do support 
multiple styles.  When parsing contexts or capabilities, we need a place 
to store the styles supported by the remote server and this was the 
mechanism chosen to do this.  This allows mapscript applications to 
present a choice of styles to the user and to allow them to change 
between styles.  MapServer (as a WMS client) will append the appropriate 
STYLE= to GetMap requests ... the other information is there to allow 
mapscript applications to generate some sort of reasonable legend 
graphic if possible since legends are not supported through the WMS 
server yet (at least not directly).


> 
> IMHO, the only directives a user should be able to configure are:
> 
> "wms_legendurl_href"
> "wms_legendurl_width"
> "wms_legendurl_height"
> 
> (note the change to "wms_legendurl_*" from
> "wms_style_<style's_name>_legendurl_*)
> 
> If and only if they define a static image for the href.  Else, if they
> don't define anything a LegendURL should be returned in Capabilities.
> 
> This is partly addressed in bug 1001.
> 
> Comments?  I hope this made sense.

I think your suggestion would break all my code :>

> 
> ..Tom
> 
> _______________________________________________
> Mapserver-dev mailing list
> Mapserver-dev at lists.gis.umn.edu
> http://lists.gis.umn.edu/mailman/listinfo/mapserver-dev
> 

-- 
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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