[Bf-taskforce25] RNA structs for UI grouping?

[Campbell Barton]

I noticed Nicholas Bishop's recent commit r18297 uses more a number
RNA structs to wrap different parts of the material struct (giving
cleaner display in the outliner), Was this agreed on as a way to group
properties?

from talking about this a while ago having a group string was
mentioned as a way to have the UI arrange props.

I don't mean to pounce on Nicholas for doing this :), just wondering
if this is how rna should be used.

-- 
- Campbell