From Plex-XML

The appendHashFields template takes care for a hash code and hidden fields that will be used for hash code validation.

Properties

Param-Elements with field name and value attribute for the field value.

Example

Put the following template in your XSLT get hidden fields and a hash code for the two fields Foo1 and Foo2.
Usually the call-template is embedded in the otherHiddenFields template.

<xsl:template name="otherHiddenFields">

  <xsl:call-template name="appendHashFields">
    <xsl:with-param name="param">
      <param value="{$Foo1}">Foo1</param>
      <param value="{$Foo2}">Foo2</param>
    </xsl:with-param>
  </xsl:call-template>

</xsl:template>