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- Expression Constraint Language: used to define a bounded set of clinical meanings represented by either precoordinated or postcoordinated expressions; Query Language: designed to express computable queries over SNOMED CT content; and
- Templates: which allow slots to be added to expressions, expression constraints or queries, which can be filled with specific values at a later time.
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Term | Definition | ||||
|---|---|---|---|---|---|
Augmented Backus-Naur Form | A language used to define the formal syntax of another language (as defined by Internet Standard 68, RFC 5234). | ||||
| The set of rules that govern the way in which SNOMED CT expressions are represented as a plain text string. | ||||
| A set of rules that determines the permitted sets of relationships between particular types of concepts. | ||||
Equivalent To (definition status) | Indicates that the given expression is both necessary and sufficient to fully define the clinical meaning being expressed. | ||||
| A structured combination of one or more concept identifiers used to express a clinical idea. | ||||
Expression Constraint | A computable rule that can be used to define a set of clinical meanings. | ||||
| A representation of the rules that comprise the SNOMED CT Concept Model in a form that can be processed by computer software and applied to validate content. | ||||
| Representation of a clinical meaning using a combination of two or more concept identifiers is referred to as a postcoordinated expression. | ||||
| Representation of a clinical meaning using a single concept identifier is referred to as a precoordinated expression. | ||||
Subtype Of (definition status) | Indicates that the given expression is necessary but not necessarily sufficient to define the clinical meaning being expressed. |
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