code: function (schema) {
  
      var extendList = find(schema, 'extend');
      for (var extendElem in extendList) {
          if (extendList[extendElem] && extendList[extendElem].extend && _.isFunction(extendList[extendElem].extend)) {
              schema[extendElem] = extendList[extendElem].extend();
          }
      }
      return schema;
  }
docs: Extend schema by dynamic functions. Write a function that defined the schema settings for a node
  @param schema
  @returns {*}