2.1.3 Universally Unique Identifiers (UUIDs)

To manipulate and exchange data objects independently, RESQML requires use of a universally unique identifier (UUID) for each instance of a RESQML data object.

RESQML uses UUID standard RFC 4122 from the Internet Engineering Task Force (IETF) (https://tools.ietf.org/html/rfc4122 ).

According to the abstract of the RFC: "This specification defines a Uniform Resource Name namespace for UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier). A UUID is 128 bits long, and can guarantee uniqueness across space and time."

For UUIDs, RESQML is case-insensitive.