how to get property name

how do you get the name of a property?

so property expansion to get the value is:
def values_in_tigers = context.expand( '${#Project#Tigers}' )

but how do i do something like:

def names_of_tigers = context.expand( '${#Project#Tiger.NAME}' )

i know this seems redundant since i'm trying to get it to return "Tiger"... but i want to access both the name and value of the property list...

thanks!