ECL Operators
For a step by step introduction about writing ECL queries, please refer to the Expression Constraint Language specification and guide from SNOMED International.
Table 1. ECL operators
Table 2. ECL examples
For more examples, please visit the Examples section of Expression Constraint Language specification and guide.
In order to help writing ECL queries, Snow Owl offers a built-in content assist. To invoke it, press Ctrl/Cmd + Space and you can pick from a set of operators that are valid depending on the current position of the cursor.
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