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Is possible define vector style to show vector external graphic file on map in map units?

My vector is shown in fixed size. External graphic are from .svg and .png file. I tried both of file.

I think that is possible, but with .svg file?

Thanks!

Sample code:

    var wfs_layer = new OpenLayers.Layer.Vector("Vector sample", {
strategies: [new OpenLayers.Strategy.Fixed(), saveStrategy],
//projection: new OpenLayers.Projection("EPSG:4326"),
protocol: new OpenLayers.Protocol.WFS({
version: "1.1.0",
// loading data through localhost url path
url: "http://localhost:8080/geoserver/wfs",
featureNS :  ".....",
extractAttributes: true,
// layer name
featureType: "laeyr8",
geometryName: "geom",
schema: "...localhost:8080/geoserver/wfs/....."
}),
autoLoad: true
});

and vector style:

    var vector_style = new OpenLayers.Style({
'externalGraphic': "Layerfile.svg",
//'externalGraphic': "marker-gold.png",
'fillColor': '#669933', 
'fillOpacity': .5, 
'strokeColor': '#aaee77', 
'strokeWidth': 3, 
'pointRadius': 5 
});

Of course, other parameter of color or fill parameter isn`t working, in external graphic only radius work.

Is there any way to show vector in map units?

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