XQuery and Name Space

I am new to XQuery
I am running this query against the XML shown belowSELECT a
.b.value('TradeId[1]','VARCHAR(500)') as TradeId,a
.b.value('TradeType[1]','VARCHAR(500)') as TradeTypeFROM
@XMLstring.nodes(/data/Rpt_Inven/Invens/Inven') a(b)
------------------------------------------------------------------------------------------------------------------------------------------------------ <data>
<
Rpt_Inven xmlns="urn:schemas.reval.com:reportsRepInven"><Invens>
<
Inven><Level1/>
<
Level1SysId _Type=""/><Level2/>
<
Level2SysId _Type=""/><Level3/>
<
Level3SysId _Type=""/><Level4/>
<
Level4SysId _Type=""/><Entity/>
<
TradeId _Type="" _value="1053">1053</TradeId>
<
CoParty/><Customer/> <CustomerSysId _Type=""/>
<
TradeDate _Type="" _value="02/22/2004">2004-02-22</TradeDate> <TerminationDate _Type=""/>
<
EffectiveDate _Type="" _value="02/25/2004">2004-02-25</EffectiveDate>
<
MaturityDate _Type="" _value="05/25/2011">2011-05-25</MaturityDate> <ArchivedDate _Type=""/>
<
TradeDescription _value="7.3 YR FLOATING RATE DEBT: PAY 12M/1Y RPI 4.0000% REAL RATE GBP 100.0 M MAT: 2011-MAY-25">7.3 YR FLOATING RATE DEBT: PAY 12M/1Y RPI 4.0000% REAL RATE GBP 100.0 M MAT: 2011-MAY-25</TradeDescription> <TLGroup/>
<
AssetClass _value="Interest Rate">Interest Rate</AssetClass>
<
TradeResetFlag _value="0">0</TradeResetFlag> <NumOfContracts/>
<
TradeType _value="Debt">Debt</TradeType>
<
Currency1 _value="GBP">GBP</Currency1>
<
HasUnwind _value="No">No</HasUnwind>
<
CashflowsModified _value="No">No</CashflowsModified> <Currency2/>
<
DealType _value="What-If">What-If</DealType>
<
DealStatus _value="Active">Active</DealStatus>
<
TradeStatus _value="Pending">Pending</TradeStatus>
<
Aud_Version _Type="" _value="2">2</Aud_Version>
<
InternalTradeId/><CoPartyTradeId/>
<
PriceIndex/><Future/> <Broker/>
<
ExclFromLedger _value="Off">Off</ExclFromLedger>
<
ManualPotentialExpFlag _value="Off">Off</ManualPotentialExpFlag>
<
ManualFMVFlag _value="Off">Off</ManualFMVFlag>
<
TradeAcctSysId/><TradeAcctCode/>
<
Custom1 _AllowBlank="1"/><Custom2 _AllowBlank="1"/>
<
Custom3 _AllowBlank="1"/><Custom4 _AllowBlank="1"/>
<
Custom5 _AllowBlank="1"/></Inven>
</
Invens></Rpt_Inven>
</
data>
It dosent return any data but if I remove namespace from
<Rpt_Inven>
query work fine.
How to modify my query to work with NameSpace
Thank you