key/keyref access in Java....

I know key/keyref constraints' use at the XSD level.
 Can you access these key/keyrefs at the Java
 application level?
 For e.g. I need to find the number of Keyrefs
 referencing the Key in my Java app?
 
 Basically, I am trying to understand if I can
 leverage these constraints at the Java level (like
 accessing selector/field values, xpath expressions,
 etc).
 
 Or are these constraints are only used at the XSD
 level and XML validation?

 In short, how would one leverage these key/keyrefs at
the Java application level?

 Thanks for any pointers.
 
 -D 




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