How xaceclient handles recursive specification of data

Richard Durbin rd at sanger.ac.uk
Thu May 11 08:00:49 EST 2000

> In the HTML document entitled "Syntactic Definitions for the 
> ACEDB Data Base Manager", I learned that constructed types allow
> a recursive specification of data in models.  An example of this
> is in the Paper class.  There is a label called In_book whose
> type is #Paper.  As constructed types are "grafted" onto the 
> current class, this creates a potentially infinitely long class.
> This of course isn't a problem in terms of actual storage of data, 
> as the In_book label won't exist for some paper.  However,
> I was curious how xaceclient would deal with the visual
> display of the creation of a new Paper object.  Maybe I'm not
> doing something correctly, but no "In_book" label comes up, 
> and I checked the models file and found it there.
> I'd like to know how this is supposed to work, since I'm writing 
> a web interface to a particular installation of ACEDB and 
> I'm going to have to solve the same problem.  

It should work by showing the #Paper in green, rather than the places
in the model that you can add data which are in blue.  When you double
click on the green #Paper cell, it will expand out into another
(empty) model, with blue places you can add data and a new green
#Paper cell that you can double click on again if neede, and so on
recursively as long as you want (but never infinitely).

I don't know why this didn't work for you - I assure you it has worked
in general for a long time.  Perhaps you changed the models and did
not "Read Models" explicitly from the main window menu.  Models are
not updated from scratch when you restart the program.


More information about the Acedb mailing list

Send comments to us at biosci-help [At] net.bio.net