This is a common pattern-- adding an attribute on MyType that points/links to some other type and then completing the relationship back the other way.   This sequence is too complex to be accessible to someone without significant Wagneering experience, but it's so common that it would be wicked cool if "normal" folks could do it.  Someday would like to inquire about short-cutting this sequence in various ways.

name                                   type            content
-------                                    -------           -----------
MyType                               Cardtype  
MyType+*tform                   Basic          
Category                            Cardtype
Category+*rform                Pointer
Category+*options             Search        {"type":"Category"}
Category+*tform                 Basic         
Cards in Category+*rform  Search        {"plus":["category",{"refer_to","_self"}]}

I'm thinking that inheritance and default +cards might do it.  that could maybe even be accomplished by the "autocreate" mechanism.

--Lewis