@Override
    @PipelineProperty(
            description = "The output character encoding to use.", defaultValue = "UTF-8", displayPriority = 2)
    public void setEncoding(final String encoding) {
        super.setEncoding(encoding);
    }
@param ch     the characters from the XML document
@param start  the start position in the array
@param length the number of characters to read from the array
@throws org.xml.sax.SAXException any SAX exception, possibly wrapping another exception
@see #ignorableWhitespace
@see org.xml.sax.Locator
@see stroom.pipeline.filter.AbstractXMLFilter#characters(char[],
int, int)
stroom-pipeline/src/main/java/stroom/pipeline/writer/JSONWriter.java