set spec filter additionally added in xslt

    <xsl:template match="*" />

    <xsl:template match="/">

        <xsl:variable name="sets">

            <xsl:for-each select="//oai:setSpec" >

                <xsl:value-of select="text()"/>

                <xsl:text> ; </xsl:text>

            </xsl:for-each>

        </xsl:variable>

        <xsl:choose>

            <xsl:when test="not(contains($sets, 'hdl_10419_48639 ;'))" >

                <xsl:value-of select="error(QName('','filteraway'), 'is not in set hdl_10419_48639')" />

            </xsl:when>

            <xsl:otherwise>

                <xsl:element name="bundle">

                    <xsl:element name="metadata">

                <!-- Only datasets of the 'Alle Publikationen von Forscherinnen und Forschern des WZB' set -->

                <xsl:if test="/oai:OAI-PMH/oai:GetRecord/oai:record/oai:header/oai:setSpec/text() = 'hdl_10419_48639'">

                        <xsl:apply-templates select="oai:OAI-PMH/oai:GetRecord/oai:record/oai:metadata/oai_dc:dc" />

                </xsl:if>

                    </xsl:element>

                </xsl:element>

            </xsl:otherwise>

        </xsl:choose>

    </xsl:template>

    <xsl:template match="oai:OAI-PMH/oai:GetRecord/oai:record/oai:metadata/oai_dc:dc">