how to default a value for non existing node in xslt -

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i have following xml element in source , map element in target.

whenever there no node in source, want default string "none"

--------------------------source xml----------------------------------------------

<?xml version="1.0" encoding="utf-8"?> <instructions  instructiontype="gen">some message</instructions> <instructions  instructiontype="test">some other message</instructions>

---------------------------transformation xsl--------------------------------------

<xsl:if test='/ns1:orderresponse/ns1:orderresponsebody/ns1:orderresponseproperties/ns1:instructions/@instructiontype = "gen"'>     <xsl:choose>         <xsl:when test='/ns1:orderresponse/ns1:orderresponsebody/ns1:orderresponseproperties/ns1:instructions[@instructiontype = "gen"] != ""'>             <ns0:sigen>                 <xsl:value-of select='substring(/ns1:orderresponse/ns1:orderresponsebody/ns1:orderresponseproperties/ns1:instructions[@instructiontype = "gen"],1.0,199.0)'/>             </ns0:sigen>         </xsl:when>         <xsl:when test="not(/ns1:orderresponse/ns1:orderresponsebody/ns1:orderresponseproperties/ns1:instructions[@instructiontype = 'gen'])">             <ns0:sigen>                 <xsl:text disable-output-escaping="no">none</xsl:text>             </ns0:sigen>         </xsl:when>         <xsl:otherwise>             <ns0:sigen>                 <xsl:text disable-output-escaping="no">none</xsl:text>             </ns0:sigen>         </xsl:otherwise>     </xsl:choose> </xsl:if>

---------------------------------------------issue-------------------------------------------------------------

when source xml doesn't have the node @ shown below (commented), cannot default value "none" target element "ns0:sigen"

<!--instructions  instructiontype="gen">some message</instructions-->  <instructions  instructiontype="test">some other message</instructions>

i dont understand why below condition not working:

<xsl:when test="not(/ns1:orderresponse/ns1:orderresponsebody/ns1:orderresponseproperties/ns1:instructions[@instructiontype = 'gen'])">

please advise.

thanks

yogi

the first line in xslt sample says this...

<xsl:if         test='/ns1:orderresponse/ns1:orderresponsebody/ns1:orderresponseproperties/ns1:instructions/@instructiontype = "gen"'>

i.e. testing if there instructions element has instructiontype equal "gen". so, if comment instructions element, statement false, , xsl:choose inside statement not executed.

to simplify things, consider putting instructions element in variable

<xsl:variable name="gen"                select="ns1:orderresponse/ns1:orderresponsebody/ns1:orderresponseproperties/ns1:instructions[@instructiontype = 'gen']" />

then can have simple xsl:choose test this

 <ns0:sigen>     <xsl:choose>        <xsl:when test="$gen != ''"><xsl:value-of select="$gen" /></xsl:when>        <xsl:otherwise>none</xsl:otherwise>     </xsl:choose>  <ns0:sigen>

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