This is an example of a Version naming convention that isn't possible using Aperture's naming presets. It's limited to 30 characters, meaning that you can then add a two-figure counter on the end and still have a 32-character file name on export.

In the second Text Node you can replace 'Descriptor' with something like a subject, location or other descriptive text. Highlighted in green in the report window you can see what the Version Names of the two selected images will be changed to.

The workflow from this screengrab is available in the workflows forum.