code: function  getReturnDetails(spec_c) {
    var paras = getChildren(spec_c, 'para');
    return _.find(_.map(paras, function(para) {
      return getChild(para, 'simplesect');
    }), function(obj) { return ((obj != undefined) && (getAttr(obj, 'kind') == 'return')); });
  }
docs: get the detailed description of a method's return value