Group and Sum using XSLT Template

Summary

Group and Sum using XSLT Template

Content

i would like to get distinct element_name and summarized hours for selected element_name.  Thank you..

<?xml version='1.0' encoding='utf-8'?>

<CALCULATED_TIME_CARD_Hierarchy>
    <CALCULATED_TIME_CARD_UE>
        <CALCULATED_TIME_CARD_Record>
        </CALCULATED_TIME_CARD_Record>
        <CAL_TMCRD_ATTR_DTL_Hierarchy>
            <CAL_TIMECARD_ATTR_DTL_UE>
                <CAL_TMCRD_ATTR_DTL_Record>
                    <Element_Name>Doubletime</Element_Name>
                </CAL_TMCRD_ATTR_DTL_Record>
                <CAL_TMCRD_DTL_UE>
                    <CALCULATED_TIMECARD_DETAIL_UE>
                        <CAL_TMCRD_DTL_Record>
                            <Hours>1</Hours>
                        </CAL_TMCRD_DTL_Record>
                    </CALCULATED_TIMECARD_DETAIL_UE>
                </CAL_TMCRD_DTL_UE>
            </CAL_TIMECARD_ATTR_DTL_UE>