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The expression constraint language must support the following capabilities:
Function | Details | ||||||
Concept reference | The ability to reference a precoordinated SNOMED CT concept using its identifier and optional human-readable term. | ||||||
Concept hierarchy | The ability to refer to a set of concepts which is exactly equal to the descendants, descendants and self, ancestors, or ancestors and self of a given concept. | ||||||
Immediate children and parents | The ability to refer to a set of concepts which are either immediate children or immediate parents of a given concept (based on non-redundant
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Conjunction | The ability to connect two expression constraints, attribute groups or attribute sets via a logical AND operator. | ||||||
Disjunction | The ability to connect two expression constraints, attribute groups or attribute sets via a logical OR operator. | ||||||
Refinement | The ability to refine (or specialize) the meaning of an expression constraint using one or more attributes values. | ||||||
| Reverse | The ability to constrain the source concepts of a set of relationships, and refer to the destination concepts of these relationships. | ||||||
| Dotted attribute | The ability to refer to the value (or set of values) of an attribute that is included in the definition of a set of concepts. | ||||||
Attribute group | The ability to group a collection of attributes which operate together as part of a refinement. | ||||||
Attribute | The ability to specify an attribute name-value pair which further refines the meaning of the matching expressions. | ||||||
Attribute descendants | The ability to define an attribute which may apply to either the descendants of the given attribute name, or the descendants and self of the given attribute name. | ||||||
Nesting | The ability to use an expression constraint to represent the valid set of attribute names and/or attribute values. | ||||||
Concrete values | The ability to use integers, decimals, strings and strings booleans as attribute values. | ||||||
Concrete value comparison | The ability to compare the attribute value of the matching expressions with the attribute value in the expression constraint using mathematical comparison operators (e.g. =, <, >, <=, >=, !=). | ||||||
Member of | The ability to refer to a set of concepts that are referenced by members of a reference set (or set of reference sets). | ||||||
Exclusion | The ability to filter out a set of expressions from the result, by either removing expressions whose focus concept is in a specific set, or removing expressions whose attribute value matches a given value. | ||||||
Any | The ability to refer to any concept in the substrate, without relying on the availability of a single root concept. |
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