如何使用xslt将变量从模板发送到全局参数

Question

我有一个模板如下。

<xsl:template name="processTopicKeywords">
    <!-- 07Feb
   <fo:block xsl:use-attribute-sets="topic">
      <fo:inline xsl:use-attribute-sets="topic.title"><xsl:apply-templates/></fo:inline>
      <xsl:apply-templates select="*[contains(@class, ' topic/body ')]/*[contains(@class, ' topic/p ')]"/>
    </fo:block>  -->
     <xsl:message> + [DEBUG] processTopicKeywords</xsl:message>
   <fo:block xsl:use-attribute-sets="topic">
      <fo:inline 
        font-family="ArialRegular"
        font-size="9pt" font-weight="bold">
        <xsl:apply-templates select="*[contains(@class, ' topic/title ')]/node()"/>
        <xsl:text> </xsl:text>
      </fo:inline>
     <fo:inline>
      <xsl:apply-templates select="*[contains(@class, ' topic/body ')]/*[contains(@class, ' topic/p ')]/node()"/>
      </fo:inline>
      <xsl:variable name="keys" select="*[contains(@class, ' topic/body ')]/*[contains(@class, ' topic/p ')]/node()" />
    </fo:block>  
  </xsl:template>

我想调用变量＆＃34; keys＆＃34;它收集数据并发送到全局参数。我尝试了如下，但它没有运作

<xsl:variable name="keys" select="(processTopicKeywords)/*[contains(@class, ' topic/title ')]/node()/*[contains(@class, ' topic/body ')]/*[contains(@class, ' topic/p ')]/node()" />

有人可以帮助我吗？