[mapserver-users] How to set queryable=1 for a GROUP layer?

[Lime, Steve D (MNIT)]

Looking at mapwms.c it doesn't look like it. The code that outputs basic groups just outputs a plain <Layer> tag (L3345) with no attributes. It does look like that, at least for simple groups, it could be possible to do what you're asking by adding a private isGroupQueryable() function that would call msIsLayerQueryable() whenever a layer's group name matches the target and would return true accordingly. Not sure how that would work with subgroup support though.

Steve

From: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Rahkonen Jukka (MML)
Sent: Monday, January 04, 2016 9:44 AM
To: Mapserver-Users (mapserver-users at lists.osgeo.org) <mapserver-users at lists.osgeo.org>
Subject: [mapserver-users] How to set queryable=1 for a GROUP layer?

Hi,

I have a layer group, let's say "group_1", where all the sub-layers are queryable.  The group layer is also effectively queryable and GetFeatureInfo works if I use &QUERY_LAYERS=group_1. The problem is that the group layer is not announced announced as queryable in the GetCapabilities

<Layer>
<Name> group_1</Name>
<Title> group_1</Title>
...
       <Layer queryable="1" opaque="0" cascaded="0">
       <Name> sub_layer</Name>
    ....


I would like to see it as:
<Layer queryable="1">
<Name> group_1</Name>
<Title> group_1</Title>
....
          <Layer queryable="1" opaque="0" cascaded="0">
          <Name> sub_layer</Name>
          ....


Without queryable attribute I can't make GetFeatureInfo to work when I am cascading it with Geoserver. By reading the WMS 1.1.1 standard I feel that GeoServer is behaving as it is supposed to work: if the layer is not announced to be queryable then it is not queryable. I can't find any mention in the WMS standard that a group layer should behave in a different way than the normal layers.

7.1.4.6 Layer Attributes
A <Layer> may have zero or more of the following XML attributes: queryable, cascaded,
opaque, noSubsets, fixedWidth, fixedHeight. All of these attributes are optional and
default to 0

7.1.4.6.1 Queryable layers
A Layer is said to be "queryable" if the server supports the GetFeatureInfo operation on
that Layer. A server may support GetFeatureInfo on some of its layers but not on all. A
server shall issue a Service Exception (code="LayerNotQueryable") if GetFeatureInfo is
requested on a Layer that is not queryable.

Is there any way to add the queryable="1" attribute to a layer group?

-Jukka Rahkonen-

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