the larch

[<acad!3HARBOR!Theodor_Nelson>]

There's no assurance that there will always be a "browser," 
or anything else, in a Xanadu application.  (Of course, 
in the general sense a browser could be an overview or a list.)
We do not control what a Xanadu application is.  

There can also be multiple display methods suggested for a given 
structure, and then the user can ignore them all.  Or come up with 
a new one and link it as a suggestion to the document.  

Same for manipulation methods.  

Supplying these as a tuple, however, could be a convenience.  

T