Zigbee DataType class missing?

I am trying to use the DataType class referenced in the zigbee reference. It has some helpful static methods that make life easy.
However, the class seems to be missing and I don’t think you can explicitly import classes in the ST runtime.
Is the class really missing or am I missing something?

http://docs.smartthings.com/en/latest/ref-docs/zigbee-ref.html#datatype

It works for me if you import it first. Pulled from the SmartThings ZigBee lock code.

import physicalgraph.zigbee.zcl.DataType

Reference code

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You sir rock. Thank you.