Highlight a feature on WMS layer using OL3 + mapserver + KML

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This is regarding question :-

Highlight a feature on WMS layer using OL3 + mapserver

We are using KML file not the POSTGIS DB.

So what parameters for metadata "gml_geometries" would be there in our map file as below

LAYER TYPE LINE ... METADATA "gml_geometries" "mygeom" "gml_mygeom_type" "line" END ... END

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