Hi,

I'm trying to use geometry transformations in an SLD when displaying a
graphic for a point symbolizer. (I'm trying to have a vertical offset
for the graphic to be displayed).

I'm looking into this page for details:
http://docs.geoserver.org/stable/en/user/styling/sld-extensions/geometry-transformations.html#geometry-transformations

this is what I have in my SLD:

                    <sld:PointSymbolizer 
uom="http://www.opengeospatial.org/se/units/metre";>
                        <sld:Geometry>
                            <ogc:Function name="offset">
                                <ogc:PropertyName>the_geom</ogc:PropertyName>
                                <ogc:Literal>0</ogc:Literal>
                                <ogc:Literal>5000</ogc:Literal>
                            </ogc:Function>
                        </sld:Geometry>
                        <sld:Graphic>
                            <sld:ExternalGraphic>
                                <sld:OnlineResource xlink:type="simple" 
xlink:href="obstacle.svg"/>
                                <sld:Format>image/svg+xml</sld:Format>
                            </sld:ExternalGraphic>
                            <sld:Size>5000</sld:Size>
                        </sld:Graphic>
                    </sld:PointSymbolizer>



but, this doesn't work, and I get an error from geoserver:

org.geoserver.platform.ServiceException: The requested Style can not be used 
with this layer.  The style specifies an attribute of OAM:oam_peaks and the 
layer is: OAM:oam_peaks

    at 
org.geoserver.wms.map.GetMapKvpRequestReader.checkStyle(GetMapKvpRequestReader.java:1130)



but, I don't really understand, what would be the name for 'the
geometry'? I don't really have it named, but it's the very point that
I'm trying to symbolize, or the offset is about the graphic that is the
sibling element of this geometry function in the SLD. is there a
straightforward way to refer to that?


Akos


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