<responseITEMs xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <ITEMs>
    <ITEM libraryid="e3712df592253fcb4" featured="false" releasedate="2017-24-01 00:00:00" code="ABC001" detail="Some text" name="Dummy One" displaytitle="Dummy One" keywords="" id="1fef760bc1d61c8c" status="active" lastupdated="2016-24-01 04:53:28"/>
    <ITEM libraryid="e3712df592253fcb4" featured="false" releasedate="2017-24-01 00:00:00" code="ABC003" detail="Some text" name="Dummy Three" displaytitle="Dummy Three" keywords="" id="3e35wba1d9b32a45" status="active" lastupdated="2016-24-01 04:53:15"/>
    <ITEM libraryid="e3712df592253fcb4" featured="false" releasedate="2017-24-01 00:00:00" code="ABC002" detail="Some text" name="Dummy Two" displaytitle="Dummy Two" keywords="" id="cca6f0cab9defe80" status="active" lastupdated="2017-24-01 01:57:37"/>
  </ITEMs>
</responseITEMs>

$Json = json_encode(simplexml_load_string($data));
echo $Json;

ITEMs: {
  ITEM: [
    {
      @attributes: {
        libraryid: "e3712df592253fcb4",
        featured: "false",
        releasedate: "2017-24-01 00:00:00",
        code: "ABC001",
        detail: "Some text",
        name: "Dummy One",
        displaytitle: "Dummy One",
        keywords: "",
        id: "1fef760bc1d61c8c",
        status: "active",
        trackcount: "0",
        lastupdated: "2016-24-01 04:53:28"
      }
    },
  {
    @attributes: {..... etc

import DS from 'ember-data';
export default DS.RESTSerializer.extend({
  normalizeResponse(store, primaryModelClass, payload, id, requestType) {
    payload = {
      ITEM: {
        id: payload.ITEMs.ITEM[0]["@attributes"].id,
        type: requestType.modelName,
        name: payload.ITEMs.ITEM[0]["@attributes"].name
      }
    };
    return this._super(store, primaryModelClass, payload, id, requestType);
  }
});

export default Ember.Route.extend({
  model() {
    return this.store.findAll('ITEM');
  }
});

export default DS.Model.extend({
  name: DS.attr('string'),
});

<strong>{{ model.name }}</strong>

<ul>
  {{#each model.ITEM as |one|}}
    <li>{{one.name}}</li>
  {{/each}}
</ul>