users-to-send-notifications.xsl

<xsl:template select="people">
  // -- return a list
  <xsl:apply-templates select="entry" />
<xsl:template> 
  
<xsl:template select="entry">
  <xsl:value-of select="entry/id" /><xsl:if test="position() != last()">,</xsl:value-of>
</xsl:template>
 
<xsl:template name="form">
  <xsl:variable name="users">
    <xsl:apply-templates select="people" />  
  </xsl>
  
  <input type="fields[users][{$users}]" />
</xsl:template>