docs: public static ScorecardModel parse( PMMLParser pmml ) {
      HashMap<String,String> attrs = pmml.attrs();
      pmml.expect('>');
      pmml.skipWS().expect('<').pGeneric("MiningSchema");
      pmml.skipWS().expect('<').pGeneric("Output");
      pmml.skipWS().expect('<');
      RuleTable[] rules = pCharacteristics(pmml);
      pmml.skipWS().expect("</Scorecard>");
      String is = attrs.get("initialScore");
      double initialScore = is==null?0:PMMLParser.getNumber(is);
      return make(attrs.get("modelName"), initialScore, rules);
    }