[xsl] // and descendant interchangeable ?

[<santony@xxxxxxxxxxxxx>]

I was under the impression that descendant:: and // are exactly the same. I wrote this very simple stylesheet to extract the last occurance of the ORD element. But it doesnt work if I use //, instead if descendant:: is used, it works just fine.
// ends up printing 'dummy' >Ist occurance of ORD

Can somebody explain, the reason
Thanks
--sony


<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns="http://www.bellsouth.com/clipwfac";
     xmlns:idm="http://www.bellsouth.com/idm"; exclude-result-prefixes="idm">

    <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:template match="/">
                    <xsl:value-of select=".//idm:ORD[last()]"/>
                    <xsl:value-of select="descendant::idm:ORD[last()]"/>
    </xsl:template>
</xsl:stylesheet>

------------------------
xml used
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<message messageID="CYMND133-1083001914238000" clientID="jbbos" systemInstance="WFAC" timeToLive="0" system="DSLNMS" priority="1" cuid="WfacIDM" xmlns="http://www.bellsouth.com/idm";>
    <requestPayload>
        <wfaRequest>
            <changeDSL>
                <updates>
                    <CircuitType>P</CircuitType>
                    <ACT>A</ACT>
                    <ORD>dummy</ORD>
                    <OLD_CKT>
                        <TN>904/262/2699</TN>
                    </OLD_CKT>
                    <CN>ZZIP</CN>
                    <SA>675 WEST PEACHTREEATLANTA GA|null|null|3</SA>
                </updates>
                <additionalFields>
                    <CircuitType>P</CircuitType>
                    <ACT>A</ACT>
                    <NEW_CKT>
                        <TN>904/262/2699</TN>
                    </NEW_CKT>
                    <OLD_CKT>
                        <TN>904/262/2699</TN>
                    </OLD_CKT>
                    <ORD>CYMND133</ORD>
                    <DD>2001-12-31-05:00</DD>
                    <CN>ZZIP</CN>
                    <SN>WFAC</SN>
                    <SA>675 WEST PEACHTREEATLANTA GA|null|null|3</SA>
                    <CSU>ADF81</CSU>
                    <EXK>904363</EXK>
                    <WC>904904</WC>
                    <Notes>
                        <noteLine>MNDRFLAVH01</noteLine>
                        <noteLine>1 MAIN ST </noteLine>
                        <noteLine>00MNDR001201_SC</noteLine>
                    </Notes>
                    <CMNT>DSL service/trouble report</CMNT>
                    <MFC>Y21</MFC>
                    <FLC>DSG</FLC>
                </additionalFields>
</changeDSL>
        </wfaRequest>
    </requestPayload>
</message>





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