Existing Wording:

Conformance Requirement 3 (Measurement Period):
The value of the measurement period control variable SHALL be made available to CQL libraries as the value of the effectivePeriod element.
CQL libraries that require access to the measurement period control variable SHALL either declare the type of the "Measurement Period" parameter as an interval of DateTime or provide a default value as an interval of DateTime.

Proposed wording:

Conformance Requirement 3 (Measurement Period):
The value of the "Measurement Period" control variable SHALL be made available to CQL libraries as the value of the effectivePeriod element.
CQL libraries that require access to the "Measurement Period" control variable SHALL either declare the type of the "Measurement Period" parameter as an interval of DateTime or provide a default value as an interval of DateTime.