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    <pre><code>&lt;xsl:template match="record"&gt; &lt;xsl:text&gt;"&lt;/xsl:text&gt; &lt;xsl:apply-templates select="datafield[@tag='020']/subfield[@code='a']" /&gt; &lt;xsl:text&gt;",&lt;/xsl:text&gt; &lt;xsl:text&gt;"&lt;/xsl:text&gt; &lt;xsl:apply-templates select="datafield[@tag='020']/subfield[@code='9']" /&gt; &lt;xsl:text&gt;",&lt;/xsl:text&gt; &lt;xsl:text&gt;"&lt;/xsl:text&gt; &lt;xsl:apply-templates select="datafield[@tag='040']/subfield[@code='b']" /&gt; &lt;xsl:text&gt;",&lt;/xsl:text&gt; &lt;xsl:text&gt;&amp;#xa;&lt;/xsl:text&gt;&lt;!-- line break --&gt; &lt;/xsl:template&gt; &lt;xsl:template match="subfield"&gt; &lt;xsl:value-of select="." /&gt; &lt;xsl:if test="position() != last()"&gt;,&lt;/xsl:if&gt; &lt;/xsl:template&gt; </code></pre> <p>For larger input data sets, introducing a key will result in better overall performance:</p> <pre><code>&lt;xsl:key name="kSubfield" match="datafield/subfield" use=" concat( generate-id(ancestor::record), '|', parent::datafield/@tag, '|', @code ) " /&gt; &lt;!-- ... --&gt; &lt;xsl:template match="record"&gt; &lt;xsl:variable name="recordId" select="generate-id()" /&gt; &lt;xsl:text&gt;"&lt;/xsl:text&gt; &lt;xsl:apply-templates select="key('kSubfield', concat($recordId, '|020|a'))" /&gt; &lt;xsl:text&gt;",&lt;/xsl:text&gt; &lt;xsl:text&gt;"&lt;/xsl:text&gt; &lt;xsl:apply-templates select="key('kSubfield', concat($recordId, '|020|9'))" /&gt; &lt;xsl:text&gt;",&lt;/xsl:text&gt; &lt;xsl:text&gt;"&lt;/xsl:text&gt; &lt;xsl:apply-templates select="key('kSubfield', concat($recordId, '|040|b'))" /&gt; &lt;xsl:text&gt;",&lt;/xsl:text&gt; &lt;xsl:text&gt;&amp;#xa;&lt;/xsl:text&gt;&lt;!-- line break --&gt; &lt;/xsl:template&gt; </code></pre>
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