SLD for Polygon & centroid Label

gistfile1.txt

<?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>Landsat 8 scenes</Name>
    <UserStyle>
      <Name>Landsat 8 scenes</Name>
         <FeatureTypeStyle>
     <Rule>
       <PolygonSymbolizer>
         <Fill>
           <CssParameter name="fill">none</CssParameter>
         </Fill>
         <Stroke>
           <CssParameter name="stroke">#FFFFFF</CssParameter>
           <CssParameter name="stroke-width">2</CssParameter>
         </Stroke>
       </PolygonSymbolizer>
       <TextSymbolizer>
           <Geometry>
              <ogc:Function name="centroid">
                <ogc:PropertyName>the_geom</ogc:PropertyName>
              </ogc:Function>
            </Geometry>         
         <Label>
           <ogc:PropertyName>PATH</ogc:PropertyName> , <ogc:PropertyName>ROW</ogc:PropertyName>
         </Label>
         <Font>
           <CssParameter name="font-family">Arial</CssParameter>
           <CssParameter name="font-size">18</CssParameter>
           <CssParameter name="font-style">normal</CssParameter>
           <CssParameter name="font-weight">bold</CssParameter>
         </Font>
         <Halo>
           <Radius>3</Radius>
           <Fill>
             <CssParameter name="fill">#FFFFFF</CssParameter>
           </Fill>
         </Halo>
         <LabelPlacement>
           <PointPlacement>
             <AnchorPoint>
               <AnchorPointX>0.5</AnchorPointX>
               <AnchorPointY>0.5</AnchorPointY>
             </AnchorPoint>
           </PointPlacement>
         </LabelPlacement>
         <Fill>
           <CssParameter name="fill">#000000</CssParameter>
         </Fill>
       </TextSymbolizer>
     </Rule>
   </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>