[MapServer-users] How to use SLD generated from CLASS and how to use STYLEITEM with sld

[Trygve Aspenes via MapServer-users]

I'm looking at SLD with mapserver 8.4.0

I think I read somewhere in the docs that mapserver can generate SLD 
from a layer defined class. Not sure if this is correct. I try with my 
test with GetStyles like this:

curl 
'http://localhost:8091/okd?version=1.3.0&service=wms&request=getstyles&layers=TestLayer'

But this gives me:

<StyledLayerDescriptor version="1.1.0" 
xsi:schemaLocation="http://www.opengis.net/sld 
http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd"; 
xmlns="http://www.opengis.net/sld"; 
xmlns:ogc="http://www.opengis.net/ogc"; 
xmlns:se="http://www.opengis.net/se"; 
xmlns:xlink="http://www.w3.org/1999/xlink"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
</StyledLayerDescriptor>

So it is a valid SLD, but with no actual content

The layer part in my mapfile looks like this:
    LAYER
        NAME "TestLayer"
        TYPE RASTER
        STATUS ON
        METADATA
            "ows_sld_enabled" "true"
            "SLD_USE_FIRST_NAMEDLAYER" "true"
        END
        DATA "<raster data>"
        PROJECTION
           <some projection>
        END
        METADATA
            "wms_title" "Test Layer"
            "wms_srs" "EPSG:3857 EPSG:4326"
        END
        CLASS
            NAME " 0 -  3"
            GROUP "value"
            EXPRESSION ([pixel]>=0.0 and [pixel]<3.0)
            STYLE
                COLOR 221 95 77
            END # STYLE
        END # CLASS
        <Some more classes>
     END


Then I try to remove the CLASS definitions and add STYLEITEM with and 
sld document like this:

    LAYER
        NAME "TestLayer"
        TYPE RASTER
        STATUS ON
        STYLEITEM "sld://sld-test.xml" #Using the example of the latest 
docs p 873-874>
        METADATA
            "ows_sld_enabled" "true"
            "SLD_USE_FIRST_NAMEDLAYER" "true"
        END
        DATA "<raster data>"
        PROJECTION
           <some projection>
        END
        METADATA
            "wms_title" "Test Layer"
            "wms_srs" "EPSG:3857 EPSG:4326"
        END
     END

But still the same response with the GetStyles request as above.

What am I missing here? Any ideas?

mapserv -v says: MapServer version 8.4.0 PROJ version 9.4 GDAL version 
3.8 OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE 
SUPPORTS=CAIRO SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER 
SUPPORTS=WFS_SERVER SUPPORTS=WCS_SERVER SUPPORTS=OGCAPI_SERVER 
SUPPORTS=FASTCGI SUPPORTS=GEOS SUPPORTS=PBF INPUT=JPEG INPUT=POSTGIS 
INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE INPUT=FLATGEOBUF

Trygve
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