How do I set the root-layer of a MapServer WMS to queryable="0"?

Question

Problem

Problem Summary

I want the response of all the MapServer WMS GetCapabilities requests to not show queryable="1" in the root layers XML node.

Status Quo

The GetCapabilities response looks like this:

<Layer queryable="1">
  <Name>[value of MAP>NAME]</Name>
  <Layer queryable="1" opaque="0" cascaded="0">
    <Name>[value of MAP>LAYER>NAME]</Name>

The mapfile looks something like this:

MAP
  NAME 'SERVICE_NAME' 
  STATUS ON
  SIZE 500 500    
  UNITS meters
  SYMBOLSET '/PATH/TO/SYMBOLS'
  FONTSET '/PATH/TO/FONTSET'
  MAXSIZE 20000
  EXTENT 2513000 5401999 2604000 5501999
  PROJECTION
      "init=epsg:31466"
  END
  SHAPEPATH '/PATH/TO/SHAPE/DATA'
  OUTPUTFORMAT
    NAME png
    DRIVER 'AGG/PNG'
    MIMETYPE 'image/png'
    IMAGEMODE RGBA
    EXTENSION 'png'
    TRANSPARENT ON    
  END

  LEGEND
    IMAGECOLOR 255 255 255
    STATUS ON
    TRANSPARENT ON
    KEYSIZE 18 12
    LABEL
      TYPE BITMAP
      SIZE MEDIUM
      COLOR 0 0 89
    END
  END

  WEB
    // ...
    METADATA
    // ...
    END
  END

  // Now the layers

END

Desired State

The response should look like this:

<Layer>
  <Name>[value of MAP>NAME]</Name>
  <Layer queryable="1" opaque="0" cascaded="0">
    <Name>[value of MAP>LAYER>NAME]</Name>

Additional Context

• Debian Buster
• MapServer v7.2.2

<!-- MapServer version 7.2.2 OUTPUT=PNG OUTPUT=JPEG OUTPUT=KML SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=CAIRO SUPPORTS=SVG_SYMBOLS SUPPORTS=RSVG SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS SUPPORTS=PBF INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE -->

Question

How can I disable the queryable attribute as default for root layers?

My research

When I tried to find the options in the documentation all I found was "To be queryable, each mapfile LAYER must have a TEMPLATE defined, or each CLASS within the LAYER must have a TEMPLATE defined." Introduction to MapServer. This does however not mention how to influence the behaviour of the root layer.

This behavior seems to have changed from the version used in Debian Stretch to v7.2.2. I would usually not care, but I have follow up problems due to this attribute and they did not exist in the previous version.

Answer 1

The described desired state got achieved by adding the following line in the mapfile. This has to be done per mapfile as there is no such default available just yet.

MAP
// ...
  WEB
  // ...
    METADATA
    // ...
      'wms_rootlayer_name' ''
    // ^ this line has to be added!
    END
  END
// ...
END

The result will be almost exactly as described in Desired State:

<Layer>
  <Layer queryable="1" opaque="0" cascaded="0">
    <Name>[value of MAP>LAYER>NAME]</Name>

The root-layers <Name> tag is also gone, but more importantly the queryable="1" is being omitted.

---

The solution was pointed out by @user30184 in the comments.