SLD transform with BarnesSurface -> RasterAsPointCollection

<?xml version="1.0" encoding="ISO-8859-1"?>
   <StyledLayerDescriptor version="1.0.0"
       xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd"
       xmlns="http://www.opengis.net/sld"
       xmlns:ogc="http://www.opengis.net/ogc"
       xmlns:xlink="http://www.w3.org/1999/xlink"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
     <NamedLayer>
       <Name>Dot size by band</Name>
       <UserStyle>
         <Title>Dot size by band</Title>
         <Abstract>
           Symbol of a RasterAsPointCollection where point's size depend of the value from a
           Barnes Surface Interpolation that takes a point data source.
         </Abstract>
         <FeatureTypeStyle>
          <!-- Transforms an irregular point data source on a grid of
               regular points with an interpolated value -->
          <Transformation>
            <ogc:Function name="gs:RasterAsPointCollection">
              <ogc:Function name="parameter">
                <ogc:Literal>data</ogc:Literal>
                <ogc:Function name="gs:BarnesSurface">
                  <ogc:Function name="parameter">
                    <ogc:Literal>data</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>valueAttr</ogc:Literal>
                    <ogc:Literal>valor</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>dataLimit</ogc:Literal>
                    <ogc:Literal>100</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>scale</ogc:Literal>
                    <ogc:Literal>.3</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>convergence</ogc:Literal>
                    <ogc:Literal>0.5</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>passes</ogc:Literal>
                    <ogc:Literal>3</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>minObservations</ogc:Literal>
                    <ogc:Literal>2</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>maxObservationDistance</ogc:Literal>
                    <ogc:Literal>.8</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>pixelsPerCell</ogc:Literal>
                    <ogc:Literal>20</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>outputBBOX</ogc:Literal>
                    <ogc:Function name="env">
                      <ogc:Literal>wms_bbox</ogc:Literal>
                    </ogc:Function>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>outputWidth</ogc:Literal>
                    <ogc:Literal>20</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>outputHeight</ogc:Literal>
                    <ogc:Literal>20</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="parameter">
                    <ogc:Literal>queryBuffer</ogc:Literal>
                    <ogc:Literal>40</ogc:Literal>
                  </ogc:Function>
                </ogc:Function>
              </ogc:Function>
            </ogc:Function>
          </Transformation>
          <!-- Minimal symbol with a dot and a label with the
               interpolated value-->
          <Rule>
           <PointSymbolizer>
             <Graphic>
               <Mark>
                 <WellKnownName>circle</WellKnownName>
                 <Fill>
                   <CssParameter name="fill">#FF0000</CssParameter>
                 </Fill>
               </Mark>
               <Size>3</Size>
             </Graphic>
           </PointSymbolizer>
           <TextSymbolizer>
             <Label>
               <!-- what is the property name of a RasterAsPointCollection??? -->
               <ogc:PropertyName>Band1</ogc:PropertyName>
               <!-- what is the property name of a RasterAsPointCollection??? -->
             </Label>
           </TextSymbolizer>
          </Rule>
         </FeatureTypeStyle>
       </UserStyle>
     </NamedLayer>
    </StyledLayerDescriptor>