This International Standard? provides a set of datatype definitions for representing and exchanging basic concepts that are commonlyencountered in healthcare environments in support of information exchange in the healthcareenvironment;? specifies a collection of healthcare-related datatypes suitable for use in a number of health-relatedinformation environments;? declares the semantics of these datatypes using the terminology, notations and datatypes defined inISO/IEC 11404, thus extending the set of datatypes defined in that standard;? provides UML definitions of the same datatypes using the terminology, notation and types defined inUnified Modelling Language (UML) version 2.0;? specifies an XML (Extensible Mark-up Language) based representation of the datatypes.The requirements which underpin the scope reflect a mix of requirements gathered primarily from HL7Version 3 and ISO/IEC 11404, and also from CEN/TS 14796, ISO 13606 (all parts) and past ISO work onhealthcare datatypes.