private void deprecatedSchema(final String uri) throws SAXException {
        sb.append("Schema is deprecated: ");
        sb.append(uri);
        errorHandler.warning(new SAXParseException(sb.toString(), locator));
        sb.clear();
    }
Sends characters to the current validator handler.

@param ch     Characters.
@param start  Start of char buffer.
@param length Number of chars to send.
@throws SAXException Not thrown.
@see stroom.pipeline.filter.AbstractXMLFilter#characters(char[],
int, int)
stroom-pipeline/src/main/java/stroom/pipeline/filter/SchemaFilter.java