@Override
    public void setDocumentLocator(Locator locator) {
        if (contentHandler == null) {
            return;
        }
        contentHandler.setDocumentLocator(locator);
    }
@see org.xml.sax.helpers.XMLFilterImpl#setDocumentLocator(org.xml.sax.Locator)
src/nu/validator/servlet/OutlineBuildingXMLReaderWrapper.java