[Developers] Measurement types

[James Taylor]

Hi, I'm trying to write to the survival_rate topic (
http://www.freebase.com/type/schema/medicine/survival_rate), but cannot
figure out what types the properties "years" and "rate" are.  On this schema
page they are typed as "Measurement (Year)" and "Measurement (Property)" but
I can't find these types and/or don't know how to use them.  More
specifically, when writing to the "disease_stage" property, the type
(/medicine/disease_stage)
is a useful thing to know.

Does anyone know how to manage these types?

Thanks much!
-James
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