xpath question

I have the following code....

<xsl:for-each select="/page/Building_Facilities">
<xsl:sort select="@Facility_Type"/>

<xsl:choose>
<xsl:when
test="not(@Facility_Type=following-sibling::this
for-each loops next sibling)">


what is the syntax for "this for-each loops next
sibling" in the when test please

regards,

Adam

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