<Flight ElapsedTime="760" GroundTime="0" ArrDayOffset="00">
−
	<Dep Stops="00" LegID="1047469" Frequency="     6 " DepTime="1900-01-01T11:00:00" ElapsedTime="760" CodeShareInd="0" EquipChangeInd="N">
<EffFrom>2008-03-29</EffFrom>
<EffTo>2008-03-29</EffTo>
<Equipment Code="346">Airbus Industrie A340-600</Equipment>
<Carrier Code="VS" FlightNumber="251">Virgin Atlantic Airways</Carrier>
<SAD/>
−
	<Classes>
<Fst/>
−
	<Bus>
<PRBD_PassengerClass PRBDCode="J"/>
<PRBD_PassengerClass PRBDCode="D"/>
<PRBD_PassengerClass PRBDCode="Z"/>
<Meal MealCode="L"/>
<Meal MealCode="S"/>
</Bus>
−
<Eco>
<PRBD_PassengerClass PRBDCode="W"/>
<PRBD_PassengerClass PRBDCode="S"/>
<PRBD_PassengerClass PRBDCode="K"/>
<PRBD_PassengerClass PRBDCode="Y"/>
<PRBD_PassengerClass PRBDCode="B"/>
<PRBD_PassengerClass PRBDCode="L"/>
<PRBD_PassengerClass PRBDCode="M"/>
<PRBD_PassengerClass PRBDCode="Q"/>
<PRBD_PassengerClass PRBDCode="X"/>
<PRBD_PassengerClass PRBDCode="N"/>
<Meal MealCode="L"/>
<Meal MealCode="S"/>
</Eco>
</Classes>
<City CityCode="SHA">Shanghai</City>
<Port PortCode="PVG">Shanghai Pudong International Apt</Port>
<Country CountryCode="CN">China                                  </Country>
<SubCountry>
</SubCountry>
<State>
</State>
<Term TermCode="2">Terminal 2        </Term>
</Dep>
−
	<Arr ArrTime="1900-01-01T15:40:00">
<City CityCode="LON">London</City>
<Port PortCode="LHR">London Heathrow Apt</Port>
<Country CountryCode="GB">United Kingdom                         </Country>
<SubCountry>
</SubCountry>
<State>
</State>
<Term TermCode="3">Terminal 3        </Term>
</Arr>
</Flight>
−
	<Flight ElapsedTime="760" GroundTime="0" ArrDayOffset="00">
−
	<Dep Stops="00" LegID="1047456" Frequency="     6 " DepTime="1900-01-01T11:00:00" ElapsedTime="760" CodeShareInd="0" EquipChangeInd="N">
<EffFrom>1900-01-01</EffFrom>
<EffTo>2008-03-22</EffTo>
<Equipment Code="346">Airbus Industrie A340-600</Equipment>
<Carrier Code="VS" FlightNumber="251">Virgin Atlantic Airways</Carrier>
<SAD/>
−
	<Classes>
<Fst/>
−
	<Bus>
<PRBD_PassengerClass PRBDCode="J"/>
<PRBD_PassengerClass PRBDCode="D"/>
<PRBD_PassengerClass PRBDCode="Z"/>
<Meal MealCode="L"/>
<Meal MealCode="S"/>
</Bus>
−
	<Eco>
<PRBD_PassengerClass PRBDCode="W"/>
<PRBD_PassengerClass PRBDCode="S"/>
<PRBD_PassengerClass PRBDCode="K"/>
<PRBD_PassengerClass PRBDCode="Y"/>
<PRBD_PassengerClass PRBDCode="B"/>
<PRBD_PassengerClass PRBDCode="L"/>
<PRBD_PassengerClass PRBDCode="M"/>
<PRBD_PassengerClass PRBDCode="Q"/>
<PRBD_PassengerClass PRBDCode="X"/>
<PRBD_PassengerClass PRBDCode="N"/>
<Meal MealCode="L"/>
<Meal MealCode="S"/>
</Eco>
</Classes>
<City CityCode="SHA">Shanghai</City>
<Port PortCode="PVG">Shanghai Pudong International Apt</Port>
<Country CountryCode="CN">China                                  </Country>
<SubCountry>

</SubCountry>
<State>
</State>
<Term TermCode="1">Terminal 1        </Term>
</Dep>
−
	<Arr ArrTime="1900-01-01T15:40:00">
<City CityCode="LON">London</City>
<Port PortCode="LHR">London Heathrow Apt</Port>
<Country CountryCode="GB">United Kingdom                         </Country>
<SubCountry>
</SubCountry>
<State>
</State>
<Term TermCode="3">Terminal 3</Term>
</Arr>
</Flight>


the way that i use to solve the problems
      dep_bus = Array.new
      num=0
      REXML::XPath.each(xml, '//Bus') do |t|
        dep_bus << t
        num+=1
        #puts "#{self.describe(t)}."
    end
    p dep_bus.length
    puts dep_bus[0]
      REXML::XPath.each(dep_bus[0], "//Bus/PRBD_PassengerClass") do |r|
        p r
      end
it is not working

the result that i get in console