如何删除重复的元素

Question

我需要使用“Name”提取客户名称，并通过删除重复的名称将其保存在变量中，如下所示。输入是任何虚拟xml

像响应变量应该只有这个

    <customer name="Name">John; Kevin; Leon; Adam</customer>

使用了这个样式表

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xsl:template match="/">
        <xsl:variable name="request">
            <customers>
                <customer name="Address">1 Doe Place</customer>
                <customer name="State">OH</customer>
                <customer name="Name">John</customer>
                <customer name="Name">Kevin</customer>
                <customer name="Name">Leon</customer>
                <customer name="Name">Adam</customer>
                <customer name="Name">Leon</customer>
                <customer name="Name">Adam</customer>
                <customer name="Name">John</customer>
                <customer name="city">Columbus</customer>
            </customers>
        </xsl:variable>
        <xsl:variable name="response" >
        <xsl:for-each select="$request/customers/customer[@name = 'Name']">
       <xsl:copy-of select="./text()"/>
        <xsl:if test="position()!=last()">; </xsl:if>
        </xsl:for-each>
        </xsl:variable>
        <xsl:copy-of select="$response"/>
    </xsl:template>
</xsl:stylesheet>

这会生成

  <customer name="Name">John; Kevin; Leon; Adam; Leon; Adam; John</customer>

但未删除重复的名称