docs: protected void addResourcePropertyRules(Digester digester, String xpath) {
  
          String xp_props = xpath + N_PROPERTIES + "/" + N_PROPERTY;
          // first rule in case the type is implicit
          digester.addCallMethod(xp_props, "addProperty");
          // second rule in case the type is given
          digester.addCallMethod(xp_props, "addProperty", 1);
          digester.addCallParam(xp_props, 0, A_TYPE);
  
          digester.addCallMethod(xp_props + "/" + N_NAME, "setPropertyName", 0);
          digester.addCallMethod(xp_props + "/" + N_VALUE, "setPropertyValue", 0);
  
      }