Removing duplicates in Merge

Hi friends, 
I am new to xslt. I am facing a problem in merging 2 xml files into 1.
I am suceeded in that but my next requirement is that duplicate rows
should come only once. Can anyboy help me in removing in duplicates?
Here I am attaching the zip file which contains the files related to this one. 

input : delivery.xml this file contains names of files to be
merged(i.e a.xml and b.xml)
XSLT : merge.xsl 
I am also enclosing the files to be merged(i.e a.xml and b.xml) 

This is very urgent for me. 

Thanks in advance. 

Jithu 

Input File A

<?xml version="1.0" encoding="UTF-8"?>
<products>
        <product>
                <nodes>
                        <node>1</node>
                        <node>2</node>
                        <node>4</node>
                </nodes>
        </product>
</products>

Input File B

<?xml version="1.0" encoding="UTF-8"?>
<products>
        <product>
                <nodes>
                        <node>2</node>
                        <node>3</node>
                </nodes>
        </product>
</products>

Input File Delivery
<?xml version="1.0" encoding="UTF-8"?>
<delivery sender="provisioner">
        <subscription id="" time.stamp="">
                <file.delivery.info>
                        <files level="product" total.files="2">
                                <file name="b.xml"/>
                                <file name="a.xml"/>
                        </files>
                </file.delivery.info>
        </subscription>
</delivery>

XSL File 

<?xml version="1.0" encoding="UTF-8"?>
<xsl:transform version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
        <!--
        -->
        <xsl:output method="xml" indent="no" encoding="UTF-8"/>
        <!--
        -->
        <xsl:template match="/">
                <products>
                        <product>
                                <nodes>
                                        <xsl:for-each 
select="delivery/subscription/file.delivery.info/files/file">
                                                <!--xsl:message terminate="no">
                                                        <xsl:value-of 
select="@name"/>
                                                </xsl:message-->
                                                <xsl:for-each 
select="document(./@name)">
                                                        <xsl:apply-templates 
select="*"/>
                                                </xsl:for-each>
                                        </xsl:for-each>
                                </nodes>
                        </product>
                </products>
        </xsl:template>

        <xsl:template match="node">
                <xsl:for-each select=".">
                        <xsl:copy-of select="."/>
                </xsl:for-each>
        </xsl:template>
</xsl:transform>


Jithu

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