O

Name	Kind	Description
OBJECT_ID	class	Ancestor class of identifiers of informational objects. Ids may be completely meaningless, in which case their only job is to refer to something, or may carry some information to do with the identified object. Object ids are used inside an object to identify that object. To identify another object in another service, use an OBJECT_REF, or else use a UID for local objects identified by UID. If none of the subtypes is suitable, direct instances of this class may be used.
OBJECT_ID	artifact
object_id	operation	Unique identifier for logical object of which this identifier identifies one version; normally the object_id will be the unique identifier of the version container containing the version referred to by this OBJECT_VERSION_ID instance.
OBJECT_REF	class	Class describing a reference to another object, which may exist locally or be maintained outside the current namespace, e.g. in another service. Services are usually external, e.g. available in a LAN (including on the same host) or the internet via Corba, SOAP, or some other distributed protocol. However, in small systems they may be part of the same executable as the data containing the Id.
OBJECT_REF	artifact
OBJECT_VERSION_ID	class	Globally unique identifier for one version of a versioned object; lexical form: object_id ::' creating_system_id ::' version_tree_id
OBJECT_VERSION_ID	artifact
OBSERVATION	class	Entry subtype for all clinical data in the past or present, i.e. which (by the time it is recorded) has already occurred. OBSERVATION data is expressed using the class HISTORY<T>, which guarantees that it is situated in time. OBSERVATION is used for all notionally objective (i.e. measured in some way) observations of phenomena, and patient-reported phenomena, e.g. pain. Not to be used for recording opinion or future statements of any kind, including instructions, intentions, plans etc.
OBSERVATION	artifact
occurrences	attribute	Occurrences of this object node in the data, under the owning attribute. Upper limit can only be greater than 1 if owning attribute has a cardinality of more than 1.
occurrences	attribute
offset	operation	Offset of this event from origin, computed as time.diff(parent.origin)
ontology	relation	The ontology of the archetype.
ontology	package	All linguistic and terminological entities in an archetype are represented in the ontology part of an archetype, whose semantics are given in the Ontology package
ontology_class_diag (am)	class diagram	Classes in the am.archetype.ontology package. Includes ARCHETYPE_ONTOLOGY, ARCHETYPE_TERM.
ontology_cv	class view
ontology_dv	deployment view
op_eq	attribute	Equals operator ( =' or ==')
op_le	attribute	Less-than or equals operator ( <=')
op_ne	attribute	Not equals operator ( !=' or /=' or <>')
openehr	package	The openEHR Foundation - see http://www.openehr.org
openEHR 1.0.1 - draft	package	openEHR Specification Release 1.0.1
OPENEHR_CODE_SET_IDENTIFIERS	class	List of identifiers for code sets in the openEHR terminology.
OPENEHR_CODE_SET_IDENTIFIERS	artifact
openehr_code_sets	operation	Set of all code set identifiers known in the terminology service.
OPENEHR_DEFINITIONS	class	Inheritance class to provide access to constants defined in other packages.
OPENEHR_DEFINITIONS	artifact
openehr_dv	deployment view
openehr_profile	package	The openEHR Archetype Profile is used to define custom archetype classes and in some cases, custom syntax equivalents (essentially shorthands) that can be used instead of the AOM generic classes for archetyping certain RM classes. The internal structure of the package mimics the structure of the reference model it profiles, i.e. the openEHR reference model. This is done to make software development easier, even though the package structure may be sparsely populated. Packages need only be defined where there are custom types to be defined; the only ones currently defined are in the data_types package.
OPENEHR_TERMINOLOGY_GROUP_IDENTIFIERS	class	List of identifiers for groups in the openEHR terminology.
OPENEHR_TERMINOLOGY_GROUP_IDENTIFIERS	artifact
openehr_test	artifact
openehr_test_deploy	deployment diagram	For testing openehr class implementations
operand	relation
operational_template	package
operator+	operation	Sum of this quantity and another whose formal type must be the difference type of this quantity.
operator-	operation	Negated version of current object, such as used for representing a difference, e.g. a weight loss.
operator<	operation	Tests if this date is earlier than the cited date.
operator<	operation	Tests if this item is less than other, which must be of the same concrete type.
operator=	operation
operator=	operation	assignment operator
OPERATOR_KIND	class	Enumeration type for operator types in assertion expressions
OPERATOR_KIND	artifact
optional	attribute	Constant to indicate optional presence of something.
Ordered	class
Ordered	artifact
org	package	International top level
origin	attribute	Time origin of this event history. The first event is not necessarily at the origin point.
original_author	attribute	Original author of this resource, with all relevant details, including organisation.
original_content	attribute	Optional inline inclusion of or reference to original content corresponding to the openEHR content at this node. Typically a URI reference to a document or message in a persistent store associated with the EHR.
original_language	attribute	Language in which this resource was initially authored. Although there is no language primacy of resources overall, the language of original authoring is required to ensure natural language translations can preserve quality. Language is relevant in both the description and ontology sections.
original_resource_uri	attribute	URIs of original clinical document(s) or description of which resource is a formalisation, in the language of this description item; keyed by meaning.
ORIGINAL_VERSION	class	A Version containing locally created content and optional attestations.
ORIGINAL_VERSION	artifact
originating_system_audit	relation	Any audit information for the information item from the originating system.
originating_system_item_ids	attribute	Identifiers used for the item in the originating system, e.g. filler and placer ids.
other_context	attribute	Other optional context which will be archetyped.
other_contributors	attribute	Other contributors to the resource, probably listed in name <email> form.
other_details	attribute	Any other details of the EHR summary object, in the form of an archetyped Item_structure.
other_details	attribute	Additional non language-senstive resource meta-data, as a list of name/value pairs.
other_details	attribute	Additional language-senstive resource metadata, as a list of name/value pairs.
other_details	attribute	Any other meta-data.
other_input_version_uids	attribute	Identifiers of other versions whose content was merged into this version, if any.
other_participation	attribute	Other participations at ENTRY level.
other_reference_ranges	relation	Optional tagged other reference ranges for this value in its particular measurement context.
owner	relation
owner_id	operation	Unique identifier of the owning VERSIONED_OBJECT.
owner_id	attribute	Reference to object to which this version container belongs, e.g. the id of the containing EHR or other relevant owning entity.