define default enumeration

https://jazz.net/wiki/bin/view/Main/AttributeValueProviders

I did default value provider of Description item.
But I want to set define default enumeration values,it' not working as description item

dojo.provide("com.example.common.Enumtor");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");


(function() {

var WorkItemAttributes= com.ibm.team.workitem.api.common.WorkItemAttributes;

var instructions= {
"priority.literal.l01": "guidelines"
}

dojo.declare("com.example.common.Enumtor", null, {

getDefaultValue: function(attribute, workItem, configuration) {

var instruction= instructions;
return instruction || "";
}
});

})();