xquery solver

    for $it in $input
    return
    <Logic>
        {
            for $x in $it/Shipment
            return
                <Shipment>
                        <ShipmentHeader>
                        {
                            let $head := $x/ShipmentHeader
                            return data($head)
                        }
                        </ShipmentHeader>
                        <Data>
                        {
                            let $date := $x/Date
                            let $day := substring(data($date),1,2)
                            let $month := substring(data($date),4,2)
                            let $year := substring(data($date),7,4)

                            let $subString := concat($year, $month, $day)
                            return $subString
                        }
                        </Data>
                        <ShipmentNumber>
                        {
                            let $num := $x/ShipmentNumber
                            return data($num)
                        }
                        </ShipmentNumber>
                </Shipment>

        }
         <Shipper>
        {
            let $shipper := $it/Shipper/*
            return $shipper
        }
        </Shipper>
        <Position>
            <Amount>
            {
                let $head := ($it/Position/Amount)
                return sum(data($head))
            }
            </Amount>
            <Weight>
            {
                let $head := ($it/Position/Weight)
                return sum(data($head))
            }
            </Weight>
            <Length>
            {
                let $head := ($it/Position/Length)
                return sum(data($head))
            }
            </Length>
            <Width>
            {
                let $head := ($it/Position/Width)
                return sum(data($head))
            }
            </Width>
           <Height>
            {
                let $head := ($it/Position/Height)
                return sum(data($head))
            }
            </Height>
        </Position>
    </Logic>