Read more than one values from Variable in Filtering condtions

I am trying to pass multiple values from a variable in JavaScript activity into filter condition next activity, however constantly getting an error saying 'res.getElementsByTagName is not a function'.

Can anyone please have a look and help with their valuable input.

The code I am using is:

var winner = xtk.queryDef.create(<queryDef schema="nms:delivery" operation="select">
<select>
<node expr="@id"/>
<node expr="@internalName"/>
<node expr="@state"/>
<node expr="@created"/>
</select>
<where>

<condition expr={("@state = '95' ")}/>

</where>
<orderBy>
<node expr="[@created]" sortDesc="true" />
</orderBy>
</queryDef>);

res = winner.ExecuteQuery();

var resultArray = new Array();

var result= res.getElementsByTagName("nms:delivery");

for each (var row in result)
{
resultArray.push("'"+row.getAttribute("@internalName")+"'");
//resultArray.push("'"+row.@internalName+"'");

}

vars.finalResult = resultArray.join(",").slice(1,2,3,4,5);

logInfo("The Internal Names are" + vars.finalResult);