Create and individual with a specific xref?

Hi All,

Is it possible to create and individual and set the xref to a specific 
value?

The use case for this is to maintain consistent references between 
various files and/or when the xref is used as a persistent reference for 
a web application.

For example, I am parsing some web pages that use the xref for 
individuals in the url. I would like to maintain these in the Gedcom 
file I create so when I later regenerate the pages I can maintain the 
same url to individuals relationship.

Thoughts?

-Steve