<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
    <xsl:template match="/">
    { "DataCollection": [
        <xsl:for-each select="DataCollection/Technicians">
            { "id": "<xsl:value-of select="Technician/@id"/>",
            "firstname:" <xsl:value-of select="Technician/firstname"/>",
            "lastname:" <xsl:value-of select="Technician/lastname"/>",
            "birthday:" <xsl:value-of select="Technician/birthday"/>",
            "email:" <xsl:value-of select="Technician/email"/>"
            }
            <xsl:if test="position() != last()">,</xsl:if>
        </xsl:for-each>
        ] }
    </xsl:template>

</xsl:stylesheet>