Element as value of another Element

[Shashank Gupta <gumnam_musafir@yahoo.com>]

Hi, 

I want to define an element of type string such that it's value can be either of :
-any string
-value of another element of type string 

I am using Schema. 
Something like :
<xs:simpleType name="a" value = any string OR another element b of type string>

thanks


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