我正在尝试通过模型关联编写嵌套的XML数据,但我无法继续。首先是XML:AcardThat'sadescription100intThosenotes...模型代码如下:Ext.define('generalData',{extend:'Ext.data.Model',fields:['name','description']});Ext.define('specificData',{extend:'Ext.data.Model',fields:['number','type']});Ext.define('otherStuff',{extend:'Ext.data.Model',fi