ECL 2.0 Proposal

• The approach agreed at last week's SLPG meeting, and supported by SNOMED International is

• as follows:
  1. To select and/or filter columns of a reference set, reference set field names will be used
  2. Field names will come directly from the international RF2 specification (http://snomed.org/rfs), if the associated reference

• 1. set type is defined there. In all other cases, the field names will either come from another specification (e.g. a national specification) or directly from the RF2 files themselves.
     E.g.

• 1. • ^ 447562003 |ICD-10 complex map reference set|  {{ M mapGroup = #2, mapPriority = #1, mapTarget = "J45.9" }}
     • ^ [referencedComponentId, mapTarget]  816210007 |SNOMED CT to MedDRA simple map reference set|
  2. The reference set type concepts in the international RFS, will always be a < 900000000000455006 |Reference set| that has a refset descriptor and has no ancestor with a refset descriptor.
     • Note: All other reference set concepts above the refset types are refset grouper concepts (which do not themselves have refset descriptors)
• A computable representation of these international reference set patterns will be shared. Effective ways of distributing this computable representation can be

• discussed.

Expression Constraint Language 2.0 WIP

Please review updates to the following pages:

• 1. Introduction (History)
• 3.2 Expression Constraint and Query Requirements
• 4. Logical Model
• 4.1 Details
• 5.1 Brief Syntax (Normative)
• 5.2 Long Syntax (Informative)
• 5.3 Informative Comments
• 5.4 Order of Operation
• 6.1 Simple Expression Constraints (Member Of) **
• 6.8 Description Filters (Module, Effective Time, Active Filters)
• 6.10 Member Filters **
• 6.11 History Supplements
• Appendix D - ECL Quick Reference