OWL Expression Reference Set Specification
Purpose
An 762676003 | OWL expression type reference set| associates description logic statements with SNOMED CT concept in the OWL functional syntax.
The SNOMED CT International Release contains content in two reference sets that follow the 762676003 | OWL expression type reference set| pattern:
The 733073007 | OWL axiom reference set (foundation metadata concept)| , in which the OWL expressions represent axioms that form the logical definition of the concept identified by the referencedComponentId
The 762103008 | OWL ontology reference set (foundation metadata concept)| , in which the OWL expressions represent essential information about an ontology. This information includes, namespaces, ontology URI, ontology version URI, and import statements. The 762103008 | OWL ontology reference set (foundation metadata concept)| enables the use of prefixes in the ontology
Data Structure
An 762676003 | OWL expression type reference set| is structured as shown in the following table.
id
UUID
A 128 bit unsigned Integer, uniquely identifying this reference set member.Different versions of a reference set member share the same id but have different effectiveTime. This allows a reference set member to be modified or made inactive (i.e. removed from the active set) at a specified time.
NO
YES (Full /Snapshot)
effectiveTime
Time
The inclusive date or time at which this version of the identified reference set member became the current version.Note : In distribution files the effectiveTime should follow the short ISO date format (YYYYMM DD) and should not include the hours, minutes, seconds or timezone indicator.The current version of this reference set member at time T is the version with the most recent effectiveTime prior to or equal to time T .
YES
YES (Full)Optional (Snapshot)
active
Boolean
The state of the identified reference set member as at the specified effectiveTime .If active = 1 (true) the reference set member is part of the current version of the set, if active = 0 (false) the reference set member is not part of the current version of the set.
YES
NO
moduleId
SCTID
Identifies the SNOMED CT module that contains this reference set member as at the specified effectiveTime .The value must be a subtype of 900000000000443000 |Module (core metadata concept)| within the metadta hierarchy.
YES
NO
refsetId
SCTID
Identifies the reference set to which this reference set member belongs. In this case, a subtype descendant of 762676003 |OWL expression type reference set (foundation metadata concept)|
NO
NO
referencedComponentId
SCTID
A reference to the SNOMED CT component to be included in the reference set. The concept to which the OWL expression applies. In the case of the 733073007 |OWL axiom reference set (foundation metadata concept)| , the axiom contributes to the definitions to the defintion of the identified concept.
NO
NO
owlExpression
String
The text of OWL expression to attach to the component identified by referencedComponentId.
YES
NO
Metadata
The following metadata supports this reference set:
900000000000454005 |Foundation metadata concept| 900000000000455006 |Reference set| 762676003 |OWL expression type reference set| 762103008 |OWL ontology reference set| 733073007 |OWL axiom reference set| 900000000000457003 |Reference set attribute| 706999006 |Expression| 762677007 |OWL expression| 900000000000459000 |Attribute type| 900000000000465000 |String| 762678002 |OWL 2 language syntax|
Descriptor Template and Examples
The reference set example tables on this page have been revised as follows to aid clarity and understanding:
The first four columns which are present in all release files are not shown. The omitted columns ( id, effectiveTime, active) are used in the same way in all referenced sets to support identification, versioning and packaging. They do not directly affect the specific features of a particular reference set or reference set type.
Reference set columns that contain SNOMED CT identifiers are expanded to show details of the concept or description referenced by that identifier. In some cases, the term is shown in the same column using the expression syntax, in other cases an additional column with a name suffix '_term' has been added. In the standard reference set files only the identifier is present in the column and there is no added column for the term. When using reference sets, the term and other details of the component are looked up from the relevant component release files.
Descriptor Template
The table below shows the descriptors that define the structure of the 762676003 | OWL expression type reference set| pattern and examples of the descriptors for specific reference sets that follow this pattern.
Table 4-1: Descriptor templates for OWL expression reference rets
0
1
0
1
0
OWL Ontology Reference Set Example
Table 4-2: OWL ontology reference set example
Prefix(:=<http://snomed.info/id/>)
Prefix(owl:=<http://www.w3.org/2002/07/owl#>)
Prefix(rdf:=<http://www.w3.org/1999/02/22-rdf-syntax-ns#>)
Prefix(xml:=<http://www.w3.org/XML/1998/namespace>)
Prefix(xsd:=<http://www.w3.org/2001/XMLSchema#>)
Prefix(rdfs:=<http://www.w3.org/2000/01/rdf-schema#>)
OWL Axiom Reference Set Example
Table 4-3: OWL axiom reference set example
SubClassOf(:404684003 :138875005)
Example of SubClassOf, which is equivalent to an | Is a| relationship between most SNOMED CT concepts.
A different OWL expression is used to represent | Is a| relationships between attributes. This is shown in the row below.
SubObjectPropertyOf(:774081006 :733928003)
Example of SubObjectPropertyOf, which is equivalent to an | Is a| relationship between attributes.
EquivalentClasses(:90708001 ObjectIntersectionOf(:64572001 ObjectSomeValuesFrom(:609096000 ObjectSomeValuesFrom(:363698007 :64033007))))
Example of EquivalentClasses. which is equivalent to stating that a concept is sufficiently defined by a set of necessary relationships.
EquivalentClasses(:126516008 ObjectIntersectionOf(:64572001 ObjectSomeValuesFrom(:609096000 ObjectIntersectionOf(ObjectSomeValuesFrom(:116676008 :108369006) ObjectSomeValuesFrom(:363698007 :371311000)))))
Example of a role group with a conjunction of two relationships as its value.
TransitiveObjectProperty(:774081006)
Example of a transitive object property.
SubObjectPropertyOf(ObjectPropertyChain(:127489000 :738774007) :127489000))
Example of a property chain.
SubClassOf(ObjectIntersectionOf(:64859006 ObjectSomeValuesFrom(:609096000 ObjectSomeValuesFrom(:255234002 :387713003)) ObjectSomeValuesFrom(:609096000 ObjectSomeValuesFrom(:363698007 :272673000))) :703264005)
Example of a general concept inclusion (GCI).
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