- Created by Steve Archbold, last modified on 2020-Aug-28
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For full details including the historical background to ECL please see: Expression Constraint Language - Specification and Guide
The following Introduction to simple ECL expressions is reproduced from the above guide section A.1 Simple Expression Constraints - Valid Expressions
Expression Constraint | Valid Expression1 | |
Precoordinated | Postcoordinated | |
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* | ||
Ref | Notes |
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1 | Where necessary, these examples make some assumptions about the membership of the example reference sets. |
2 | Please note that this makes the assumption that the given expression constraint is executed against a finite set of expressions that has been pre-classified (e.g. in an expression repository), and that after classification there are no intermediate expressions between this expression and 404684003 |Clinical finding|. |
3 | Please note that this makes the assumption that the given expression constraint is executed against a finite set of expressions that has been pre-classified (e.g. in an expression repository), and that after classification there are no intermediate expressions between 40541001 |Acute pulmonary edema| and this expression. |
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Further Reading
SNOMED CT Glossary: Expression Constraint
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