Ignoring Redundancy

Hello all,

I'm actually trying to design my xsl stylesheet to

1. Select all /Classes/Class/SADefinition nodes where their @SAObjName
attribut contains the sequence 'app_'     --> OK
2. Sort the result tree according to @SAObjName attribut     --> OK
3. Applying the text to each node, but IGNORING ALL REDUNDAND NODES.
--> not OK
   (My XML File contains redundancy nodes)
I guess, the use of "following-sibling" won't help me much in this
case...

Here is the actual code :
...
<xsl:result-document href="procXml.bat" format="bat">
        <xsl:for-each
select="/Classes/Class/SADefinition[contains(@SAObjName,'app_')]">
                <xsl:sort select="@SAObjName"/>
                <xsl:if
test="not(@SAObjName=/following-sibling::*[position()=1]/@SAObjName)">

                        <xsl:text>fop -fo </xsl:text>
                        <xsl:value-of select="@SAObjName"/>
                        <xsl:text>.fo -pdf </xsl:text>
                        <xsl:value-of select="@SAObjName"/>
                        <xsl:text>.pdf&#13;&#10;</xsl:text>

                </xsl:if>
        </xsl:for-each>
</xsl:result-document>
... 


Does anyone have an idea on how to solve my problem?

Regards

Lawrence Michel