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[plt-scheme] define-datatype

Hi all,
I've been EOPL by Friedman and he in page 44 of his book mentions
that define-datatype is a scheme extension. I've not been able to
use it in DrScheme. I've searched the Help Desk and I know that
there is a eopl collection but how can I use it?

Best regards,

Paulo J. Matos : pocm(_at_)rnl.ist.utl.pt
Instituto Superior Tecnico - Lisbon    
Software & Computer Engineering - A.I.
 - > http://www.rnl.ist.utl.pt/~pocm 
	Yes, God had a deadline...
		So, He wrote it all in Lisp!