var domain = new Domain({
	
	db:{
	
		get:function(typeName,id,callback){
			......
			callback(err,obj);		
		},
		
		update:function(typeName,objData,callback){
			......
			callback(err);
		},
		
		save:function(typeName,objData,callback){
			......
			callback(err);
		},
		
		remove:function(){
			......
			callback(err);
		}
		
	}

	aggres:[
		{
			typeName:"MyAggre",
			
			methods:{
				 changeName:function(name){
				 
					this.$data("name",name);
					var AggreType = this.$domain.getAggre(typeName);
					var newAggreObj = new AggreType(data);
					AggreType.get("id002",function(aggreObj){
						
					});
					
					var myService = this.$domain.getService(serviceName);
					myService( ... );
					this.$publish("changeName",name);
					 
				 }
				 ......
			},
			validat:function(data){
				 ......
				 return true  /  false;
			}
		}
	],
	services:{
		service01:function(){
		
			var otherService = this.$domain.getService(serviceName);
			otherService( ... )
			
			var AggreType = this.$domain.getAggre(typeName);
			......
			var  aggreObj = AggreType.get(id);
			aggreObj.id   /  method 
			......
			
		}
		......
	},
	
	commands:{
	
		"change user name":function(params,callback){
			......
			callback();
		}
		
		......
	}
	
});

domain.command(["change user name", { id:"id001" , name:"new name" } ],function(err,msg){

})

domain.on(aggreTypeName,aggreID,eventName , function(data) {

})

domain.once(aggreTypeName,aggreID,eventName , function(data) {

})