XML : XML PHP (query)

I need to query an XML server : https://xmlserver.com/xml , but I do not know this language.

1: Transaction Header?

Example :

  <PNARequest>    <Version>2.0</Version>    <TransactionHeader>      <SenderID>123456789</SenderID>      <ReceiverID>987654321</ReceiverID>      <CountryCode>FR</CountryCode>      <LoginID>XX7456DMP</LoginID>      <Password>123456789</Password>      <TransactionID>Transaction_ID</TransactionID>    </TransactionHeader>    <PNAInformation SKU="1234567" Quantity="1"/>    <PNAInformation ManufacturerPartNumber="VA1926W" Quantity="1"/>    <PNAInformation UPC="8801031069613"/>    <ShowDetail>2</ShowDetail>  </PNARequest>    

I need to get:

  <PNAResponse>    <Version>2.0</Version>    <TransactionHeader>      <SenderID>Entrepot2b</SenderID>      <ReceiverID>Achats123</ReceiverID>      <ErrorStatus ErrorNumber=""></ErrorStatus>      <DocumentID>{8149EC06-DA8D-455A-9A18-949BE23769E0}</DocumentID>      <TransactionID>Gesco897568</TransactionID>      <TimeStamp>2010-12-16T12:20:23</TimeStamp>    </TransactionHeader>    <PriceAndAvailability SKU="1234567" Quantity="1">      <Price>9,60</Price>      <SpecialPriceFlag></SpecialPriceFlag>      <ManufacturerPartNumber>VA1926W</ManufacturerPartNumber>      <ManufacturerPartNumberOccurs></ManufacturerPartNumberOccurs>      <VendorNumber>C566</VendorNumber>      <Description>76.2 WIDE, 25.4 LONG, TT</Description>      <ReserveInventoryFlag>Y</ReserveInventoryFlag>      <AvailableRebQty>0</AvailableRebQty>      <Branch Name="" ID="81">        <Availability>80</Availability>        <OnOrder>20</OnOrder>        <ETADate>2011-01-28</ETADate>      </Branch>      <UPC>8801031069613</UPC>      <CustomerPartNumber></CustomerPartNumber>    </PriceAndAvailability>    </PNAResponse>    

What should be done in PHP? to view:

Price : 9.60 UPC : 8801031069613 Availability : 80

Can you help me ?

This is probably simple to do but I do not know XML

An example to tell me?

thank you ALL