Acknowledgments 

Special thanks to Danny Berlin and Lynn Conway for many suggestions and for the patience it takes to be the first real users of something new.  Sanjay Mittal and Terry Winograd offered helpful criticisms and advice on the documentation and concepts of the rule language.  Larry Masinter and Bill van Melle have provided substantial support in the entire Loops enterprise with Interlisp-D.  Thanks to the Xerox Corporation and George Pake of Xerox PARC for providing the stimulating environment and computational facilities that made this work possible.



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