Template Syntax

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Term

Definition

Augmented Backus-Naur Form (ABNF)

A language used to define the formal syntax of another language (as defined by Internet Standard 68, RFC 5234).

Gloss
tCompositional Grammar

The set of rules that govern the way in which SNOMED CT expressions are represented as a plain text string.

Gloss
tConcept Model

A set of rules that determines the permitted sets of relationships between particular types of concepts.

Gloss
tExpression

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 bounded set of clinical meanings.

Expression Constraint TemplateA SNOMED CT Expression Constraint containing slots that are intended to be processed at a later time.
Expression TemplateA SNOMED CT Expression containing slots that are intended to be processed at a later time.

Gloss
tMachine Readable Concept Model

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.

Gloss
tPostcoordinated Expression

Representation of a clinical meaning using a combination of two or more concept identifiers is referred to as a postcoordinated expression.

Gloss
tPrecoordinated Expression

Representation of a clinical meaning using a single concept identifier is referred to as a precoordinated expression.

Query TemplateA SNOMED CT Query containing slots that are intended to be processed at a later time.

Gloss
tReference Set

A SNOMED CT file structure consisting of a set of references to SNOMED CT components.

SlotA marked position in a SNOMED CT template that is either intended to be removed (and contains information about how the template should be processed), or replaced with a SNOMED CT concept, expression, token or concrete value at a later time.

Substrate

The SNOMED CT content over which an expression constraint is evaluated or a query is executed.

TemplateA SNOMED CT expression, constraint or query containing one or more slots that are intended to be processed at a later time.

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