GeoExt2 FormPanel Wfs Filtering

Question

I'm developing a web project using Extjs, GeoExt2, Openlayers etc. I'm using FormPanel from GeoExt2 to make wfs requests by filter. GeoExt Api Link

var formPanel = Ext.create('Ext.form.Panel', {
           renderTo: "formpanel",
           items: [{
               xtype: "textfield",
               name: "name__like",
               value: "mont"
           }, {
               xtype: "textfield",
               name: "elevation__ge",
               value: "2000"
           }]
       });

I create a filter like this "cond1 AND cond2 AND .." in wfs. I want to use AND and OR definition on both of them. What should I do?