What is the difference between the eCQM DERep and the CMS Data Element Library (DEL)?

The eCQM DERep is an online searchable repository providing all the data elements and definitions associated with eCQMs used in CMS quality reporting programs by eligible hospitals, critical access hospitals, and clinicians. The CMS DEL is the centralized resource for CMS assessment instrument data elements (e.g., questions and responses) and their associated health information technology standards, including the Minimum Data Set, Inpatient Rehabilitation Facility Patient Assessment Instrument, Functional Assessment Standardized Items, Outcome and Assessment Information Set, Long-Term Care Hospital Continuity Assessment Record and Evaluation Data Set, and the Hospice Item Set.