@Override
    public void endPrefixMapping(final String prefix) throws SAXException {
        if (!buffer) {
            super.endPrefixMapping(prefix);
        } else if (inRoot || afterRoot == -1) {
            length--;
        }
    }
Fired when a prefix mapping moves out of scope.

@param prefix The prefix.
@throws SAXException Not thrown.
@see stroom.pipeline.filter.AbstractXMLFilter#endPrefixMapping(java.lang.String)
stroom-pipeline/src/main/java/stroom/pipeline/filter/SplitFilter.java