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Concept reference

The ability to reference a precoordinated SNOMED CT concept using its identifier and optional human-readable term

Intersection / Conjunction

The ability to connect two focus concepts via a logical AND operator

Refinement

The ability to refine (or specialise) the meaning of an expression using one or more attributes values

Attribute group

The ability to group a collection of attributes which operate together as part of a refinement

Attribute

An attribute-value pair which further refines the meaning of the expression

Nesting

The ability to include an expression as the value of an attribute

Concrete values

The ability to use integers, decimals and strings as attribute values

Definition status

The ability to specify whether the clinical meaning is 'equivalent to' or a 'subtype of' the expression.