Re: weird problem of non shown text with xsl:value-of

<xsl:value-of select=

Is defined to give the string value of the first selected node in
document order, and discards any other nodes if more than one is
selected.
Perhaps you want the string value of the zinnen node which would be
select="oefeningen/zinnen"/>

Or something like
<xsl:for-each select="oefeningen/zinnen/zin">
<xsl:value-of select="."/>
<xsl:if test="position()!=last()"><xsl:text> </xsl:text></xsl:if>
</xsl:for-each>

David

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