xml - xsl:copy-of : could not compile select expression -

i trying transform xml file using xsl stylesheet.

xml file

<?xml version="1.0" encoding="utf-8"?> <msg>     <ent key="key1">         <text>error: not find </text>         <translation>another error similar previous one.</translation>     </ent> </msg> 

xsl file

<?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/xsl/transform" version="1.0"> <xsl:output method="text"/> <xsl:template match="msg">         <xsl:for-each select="ent">             <xsl:variable name="current_key" select="@key"/>             <xsl:variable name="match" select="$translations/msg/ent[@key = $current_key]"/>             <xsl:choose>                 <xsl:when test="$match , normalize-space($match/text) = normalize-space(.) , (not(@translate) or @translate = true())">                     <xsl:copy>                         <xsl:copy-of select="$match/(@key|translation/text())|@context"/>                     </xsl:copy>                 </xsl:when>             </xsl:choose>         </xsl:for-each>     </xsl:template> </xsl:stylesheet> 

@translate 1 of attributes have not included in example xml file.

i using perl transformation. use script mentioned in answer, when following error,

invalid expression compilation error: file test.xsl line 11 element copy-of xsl:copy-of : not compile select expression '$match/(@key|translation/text())|@context'  @ transform.pl line 10 

why select expression causing problem?

using $match/(@key|translation/text()) allowed in xpath 2.0 used in xslt 2.0 perl use xslt 1.0 processor libxslt. need spell out $match/@key | $match/translation/text().