Relation/CHD: An Internet dotted name. Either in
ASCII or as integers
Same as UUID.
The CEN Healthcare Coding Scheme Designator. (Identifiers used in DICOM follow this assignment scheme.)
Reserved for future HL7 registration schemes
An International Standards Organization Object Identifier
These are reserved for locally defined coding schemes.
Usually a base64 encoded string of random bits.
Uniform Resource Identifier
The DCE Universal Unique Identifier
An X.400 MHS format identifier
An X.500 directory name