Symbolic subdivision


I read on the user’s guide that the stereotype “symbolic subdivision” allows to segment an annotation on a Parent Tier into smaller ones on a Dependet Tier. So, why is it that, when I try it, I cannot create smaller units, as I get an annotation which exactly corresponds to the one on the parent tier? In this regard, I can’t get the difference with the “symbolic association” option. I am sure I misunderstood something. Could you please make it clearer to me?

Thank you a lot,


Yes, the first annotation (“under” a specific parent annotation) on a symbolic subdivision dependent tier looks exactly the same as a dependent annotation on a symbolic association tier. Only, when you activate that annotation on the symbolic subdivision tier, you should see two options activated that are disabled for symbolic association: the menus Annotation->New Annotation Before and Annotation->New Annotation After. These options should also show up in the right-mouse-button context menu.
These option allow you to subdivide the segment into a “chain” of smaller units.


Ok, thank you very much, now I got it.

So, if I understood correctly, the main difference between Time Subdivision and Symbolic Subdvision is the following: with a Time Subdivision stereotype, the “lenght” of each smaller unit can be modified so as to be time alligned, while with Symbolic Subdivison, smaller units are assigned each the same “lenght” that cannot be modified?

Thank you again.

Yes, that difference between time subdivision and symbolic subdivision is correct. (With symbolic subdivision the smaller units don’t have an actual “length”, only a virtual “length”, mostly for the purpose of visualization.)