Existing Wording: Authors of Profiles may leverage (and reference) DataElements when defining the data elements with the Profile. (For implementability reasons, the data constraints should still be explicitly exposed within the Profile rather than being included "by reference" to the DataElement.)

Comment:

This is difficult to understand. What does "leverage" mean? What does "when defining the data elements with the Profile" mean? Is "defining the data elements with the Profile" talking about creating new extensions to be used in a Profile? Perhaps an example or two is in order.