"name or display_id" function

[jakebeal]

On all SBOL objects, the name field is optional but preferred for display, with a fallback to displayId.
From section 6.1:

If an Identified object lacks a name, then software tools SHOULD instead display the object’s displayId or URI.

I am thus frequently writing object.name or object.display_id in user-display functions.

Does a macro function for this already exist? If not, can it please be added?

[tcmitchell]

We could add a display_name property to Identified that runs this logic, so object.display_name would return object.name if set, and object.display_id otherwise. How does that sound?

[jakebeal]

Sounds good!