GET Requirement Group-by Headers

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!--
GET: /qcbin/rest/domains/DOMAIN_NAME/projects/PROJECT_NAME/requirements/groups/req-reviewed,req-priority
ACCEPT: application/xml
-->
<GroupByHeaders>
    <GroupByHeader Value="Not Reviewed" size="2" Name="req-reviewed" Expression="&quot;Not Reviewed&quot;">
        <GroupByHeader Value="" size="2" Name="req-priority" Expression=""/>
    </GroupByHeader>
    <GroupByHeader Value="Reviewed" size="2" Name="req-reviewed" Expression="Reviewed">
        <GroupByHeader Value="" size="2" Name="req-priority" Expression=""/>
    </GroupByHeader>
</GroupByHeaders>