ECL examples

For full details including the historical background to ECL please see: Expression Constraint Language - Specification and Guide

Appendix A of that guide has links to various examples - the Appendix overview is reproduced here, including active links to its sub-pages (hover the cursor over the sub-section titles to show the links).

Below the Appendix overview, its sub-page A.1 Simple Expression Constraints - Valid Expressions is also reproduced here as a quick-reference.

Appendix A – Examples Of Valid Expressions

This appendix provides examples of expressions (both precoordinated and postcoordinated) which satisfy each of the expression constraints that were introduced in Chapter 6. This list of examples is not intended to be exhaustive, but rather to provide a representative sample to help clarify the meaning of each constraint. It is assumed that each particular usage of an expression constraint will clearly identify whether or not postcoordinated expressions are part of the valid substrate. Please refer to the SNOMED CT Languages Github repository for a set of text files containing each of these examples.

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Expression Constraint	Valid Expression¹
	Precoordinated	Postcoordinated
404684003 \| Clinical finding\|	404684003 \| Clinical finding\|	-
< 404684003 \| Clinical finding\|	64572001 \| Disease\|	404684003 \| Clinical finding\| : 363698007 \| Finding site\| = 80891009 \| Heart structure\|
	56265001 \| Heart disease\|
<< 73211009 \| Diabetes mellitus\|	73211009 \| Diabetes mellitus\|	73211009 \| Diabetes mellitus\| : 42752001 \| Due to\| = 61823004 \| Injury of pancreas\|
	46635009 \| Diabetes mellitus type 1\|
	105401000119101 \| Diabetes mellitus due to pancreatic injury\|
<! 404684003 \| Clinical finding\|	64572001 \| Disease\|	404684003 \| Clinical finding\| : 116676008 \| Associated morphology\| = 79654002 \| Edema\| ²
	267038008 \| Edema\|
> 40541001 \| Acute pulmonary edema\|	111273006 \| Acute respiratory disease\|	64572001 \| Disease\| : 116676008 \| Associated morphology\| = 79654002 \| Edema\| , 363698007 \| Finding site\| = 39607008 \| Lung structure\|
	404684003 \| Clinical finding\|
	138875005 \| SNOMED CT concept\|
>> 40541001 \| Acute pulmonary edema\|	40541001 \| Acute pulmonary edema\|	64572001 \| Disease\| : 263502005 \| Clinical course\| = 424124008 \| Sudden onset AND/OR short duration\| , { 116676008 \| Associated morphology\| = 40829002 \| Acute edema\| , 363698007 \| Finding site\| = 39607008 \| Lung structure\| }
	111273006 \| Acute respiratory disease\|
	404684003 \| Clinical finding\|
	138875005 \| SNOMED CT concept\|
>! 40541001 \| Acute pulmonary edema\|	111273006 \| Acute respiratory disease\|	19829001 \| Disorder of lung\| : { 116676008 \| Associated morphology\| = 79654002 \| Edema\| , 363698007 \| Finding site\| = 39607008 \| Lung structure\| } ³
	19242006 \| Pulmonary edema\|
^ 700043003 \| Example problem list concepts reference set\|	394659003 \| Acute coronary syndrome\|	-
	194828000 \| Angina\|
	29857009 \| Chest pain\|
*	138875005 \| SNOMED CT concept\|	404684003 \| Clinical finding\| : 363698007 \| Finding site\| = 80891009 \| Heart structure\|
	404684003 \| Clinical finding\|	71388002 \| Procedure\| : 405813007 \| Procedure site - Direct\| = 66754008 \| Appendix structure\|
	322236009 \| Paracetamol 500mg tablet\|	373873005 \| Pharmaceutical / biologic product\| : { 127489000 \| Has active ingredient\| = 412031009 \| Paracetamol or derivative\| }

Footnotes
Ref	Notes
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.

Expression Constraint	Valid Expression¹
	Precoordinated	Postcoordinated
404684003 \| Clinical finding\|	404684003 \| Clinical finding\|	-
< 404684003 \| Clinical finding\|	64572001 \| Disease\|	404684003 \| Clinical finding\| : 363698007 \| Finding site\| = 80891009 \| Heart structure\|
	56265001 \| Heart disease\|
<< 73211009 \| Diabetes mellitus\|	73211009 \| Diabetes mellitus\|	73211009 \| Diabetes mellitus\| : 42752001 \| Due to\| = 61823004 \| Injury of pancreas\|
	46635009 \| Diabetes mellitus type 1\|
	105401000119101 \| Diabetes mellitus due to pancreatic injury\|
<! 404684003 \| Clinical finding\|	64572001 \| Disease\|	404684003 \| Clinical finding\| : 116676008 \| Associated morphology\| = 79654002 \| Edema\| ²
	267038008 \| Edema\|
> 40541001 \| Acute pulmonary edema\|	111273006 \| Acute respiratory disease\|	64572001 \| Disease\| : 116676008 \| Associated morphology\| = 79654002 \| Edema\| , 363698007 \| Finding site\| = 39607008 \| Lung structure\|
	404684003 \| Clinical finding\|
	138875005 \| SNOMED CT concept\|
>> 40541001 \| Acute pulmonary edema\|	40541001 \| Acute pulmonary edema\|	64572001 \| Disease\| : 263502005 \| Clinical course\| = 424124008 \| Sudden onset AND/OR short duration\| , { 116676008 \| Associated morphology\| = 40829002 \| Acute edema\| , 363698007 \| Finding site\| = 39607008 \| Lung structure\| }
	111273006 \| Acute respiratory disease\|
	404684003 \| Clinical finding\|
	138875005 \| SNOMED CT concept\|
>! 40541001 \| Acute pulmonary edema\|	111273006 \| Acute respiratory disease\|	19829001 \| Disorder of lung\| : { 116676008 \| Associated morphology\| = 79654002 \| Edema\| , 363698007 \| Finding site\| = 39607008 \| Lung structure\| } ³
	19242006 \| Pulmonary edema\|
^ 700043003 \| Example problem list concepts reference set\|	394659003 \| Acute coronary syndrome\|	-
	194828000 \| Angina\|
	29857009 \| Chest pain\|
*	138875005 \| SNOMED CT concept\|	404684003 \| Clinical finding\| : 363698007 \| Finding site\| = 80891009 \| Heart structure\|
	404684003 \| Clinical finding\|	71388002 \| Procedure\| : 405813007 \| Procedure site - Direct\| = 66754008 \| Appendix structure\|
	322236009 \| Paracetamol 500mg tablet\|	373873005 \| Pharmaceutical / biologic product\| : { 127489000 \| Has active ingredient\| = 412031009 \| Paracetamol or derivative\| }

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