@Override
    public void startElement(final String uri, final String localName, final String qName, final Attributes atts)
            throws SAXException {
        contentPos = 0;
        elementCount++;
        super.startElement(uri, localName, qName, atts);
    }
Counts a start element.

@param uri       The element's Namespace URI, or the empty string.
@param localName The element's local name, or the empty string.
@param qName     The element's qualified (prefixed) name, or the empty string.
@param atts      The element's attributes.
@throws SAXException Not thrown.
@see stroom.pipeline.filter.AbstractXMLFilter#startElement(java.lang.String,
java.lang.String, java.lang.String, org.xml.sax.Attributes)
stroom-pipeline/src/main/java/stroom/pipeline/filter/LocationFilter.java