Geoserver sld Filter functions
• The concept of filter function is part of the OGC Filter spec. A filter function is an expression with a name and a set of arguments
• GeoServer has hundreds built-in:

For example:
If we want to draw each point in line geometry.
        <CssParameter name="stroke">#000000</CssParameter>
        <CssParameter name="stroke-width">1</CssParameter>
            <ogc:Function name="vertices">
                    <CssParameter name="fill">#ff0000</CssParameter>
And result is this :


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