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Generate unique Id when a new content is created (WCM)

Question asked by anik on May 1, 2012
I am using web-forms for authoring content in WCM using alfresco explorer.
Using XSD file alfresco generates a UI for content authoring.
In Web-project > user sandbox>web forms
we can select a web-form and click on create link to create a new content (file which is basically XML file),

My Problem
How can i generate a unique Id every time when a user create a new content using web-form
something like counter increment without user intervention so that uniqueness of a new content (XML) file is insured .

How can i achieve this in XSD??