XSLT Processor used by PI 7.11

Hi Folks,

I am trying to find the xslt processot used by PI 7.11. When I use the following and add it at the root template of the stylesheet I get the processor name when I use it in any of the xslt editors. But when I use the same code it doesn't retrieve the XSLT processor in PI. Any ideas please?

<xsl:value-of select="system-property('xsl:vendor')" />

<xsl:text>:</xsl:text>

<xsl:value-of select="system-property('xsl:vendor-url')" />