I've made a minor update that brings us to Soma 1.6.4 and SomaUI 1.0.6, you can get the new versions from the SomaUI page.
In the XML Site Definition, the attribute urlfriendly in a page node builds the URL for the deep-linking and in previous version this attribute had to be unique through the XML. It is no longer the case, you can now have identical parts in the URL.
This wasn't possible before:
Only the PageManager changed, you can update your sources from the previous version without problem.
And by the way, from now, I'll be release only minor update for Soma and SomaUI as I'm working on the v2 for both of them.