This European Standard specifies the definition and structuring of information relating to entities that are commonly encountered in communications with and between clinical information computer systems. Within the scope of this European Standard is a description of components and their use. In particular, these components relate to the following sub-domains: - Subjects of care: including persons, animals and groups of animals. This sub-domain includes descriptions of the parameters for the identification of the subjects of care. - Subject of care related parties: including next of kin and other persons and organisations related to the subject of care (including other subjects of care). - Healthcare agents: including healthcare professionals, organisations and devices. - Devices: including descriptions of their settings and use within a particular use event. - Locations: of two types: - care locations, for example, ward and bed where patient receive inpatient care, a clinic where physiotherapy booked, a nursing home, the patient\'s home etc.; - geographic locations: which are non-healthcare specific places that are related to laboratory investigations. For example: kitchens, shop counters, hotel air conditioning systems. - Transport: including the transportation of persons (patient, related person), animals, or samples/body parts. Financial: including costs associated with care services, authorisation and service agreements (contracts).