@Override
    public void startDTD(String name, String publicId, String systemId) throws SAXException {
        first.startDTD(name, publicId, systemId);
        second.startDTD(name, publicId, systemId);
    }
@param name
@param publicId
@param systemId
@throws SAXException
@see org.xml.sax.ext.LexicalHandler#startDTD(java.lang.String, java.lang.String, java.lang.String)
src/nu/validator/xml/CombineLexicalHandler.java