private static String prefixFromQname(String qname) {
        int index = qname.indexOf(':');
        if (index == -1) {
            return "";
        } else {
            return qname.substring(0, index).intern();
        }
    }
@param local
@param prefix
@param uri
resources/examples/research-src/nu/validator/svgresearch/NameTriple.java