PrintTicket Error with PTConform.exe Tool

Let me know whether this one is valid PT with 5600 build?

<psf:Feature name="psk:DocumentDuplex">
<psf:Option name="psk:OneSided"/>

<psf:Feature name="psk:DocumentBinding">
<psf:Option name="psk:BindLeft"/>
</psf:Feature>

</psf:Feature>

The PTConform Tools gives the following error:

Error: CUtility - Match not found for node 'feature', named 'DocumentDuplex'.

Error: CUtility::DoSelfConformanceCheck - The node 'Feature' named 'DocumentDuplex' is not expected here as per the printSchema Spec.

[632 byte] By [KanagalRaj] at [2007-12-24]