Filtered (current package and imports) map of { TypeName.field : String[] } - where a list is valid values to display in a drop down for a given Type.field combination.
'Person.age' : ['M=Male', 'F=Female'] 'Person.expression' :
['a\\=5=expression1', 'a\\=5*2=expression2']
This will split the drop down item into a value and a key, e.g.