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A long time ago, I wrote a pretty long essay on how to add new datatypes to Guile, intended for the reference manual. Please take a gander at: http://www.red-bean.com/~jimb/data-rep.texi Check out especially: 2:@chapter Data representation in Guile 30: @section Data Representation in Scheme 66: @subsection A Simple Representation 112: @subsection Faster Integers 207: @subsection Cheaper Pairs 305: @subsection Guile Is Hairier 321: @section How Guile does it 340: @subsection General Rules 370: @subsection Garbage Collection 454: @subsection Immediates vs. Non-immediates and 977: @section Defining New Types (Smobs) 1001: @subsection Describing a New Type 1078: @subsection Creating Instances 1169: @subsection Typechecking 1215: @subsection Garbage Collecting Smobs 1377: @subsection Garbage Collecting Simple Smobs 1406: @subsection A Complete Example The sample code there includes defining one smob which refers to other Scheme objects.