Re: Inserting a separator only between non-empty strin

and what about that ?

<xsl:variable name="concat">
<xsl:sequence>
 <xsl:value-of select="$a"/>
 <xsl:value-of select="$b"/>
 <xsl:value-of select="$c"/>
</xsl:sequence>
</xsl:variable>
<xsl:value-of separator="|" select="$concat[string-length(.) gt 0]"/>

<xsl:variable name="concat" select="($a, $b, $c)"/>
<xsl:value-of separator="|" select="$concat[string-length(.) gt 0]"/>