Accessing an element's classification branch in an expression.

[SeaGeoff]

I am writing an all inclusive keynote expression that generates text strings depending on element type. So far this is going well. One of the items in the string is an element's classification, which I have converted to natural language for this purpose (and to make it more approachable for coworkers). In those cases where the classification is a leaf in a branch I would like to use the branch in my expression. For example I have the leaf "Floor" in the branch "Covering" and I would like the string to read (in part) "...Floor Covering..." But I have not found a way to access the branch name in my expression. Is this possible? Thanks.

[gdford]

Great question - I would like to be able to drill down (actually drill up) to a childs classification parent in a schedule or with autotext for exactly the same reason. 
I would really like to chat with you about your keynote strategy. I am doing a number of things with property expressions and property option sets to provide better single source bim. I am eager for better keynote solutions.