Expression Constraint Language

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In some cases, the valid set of attribute names can be represented using an expression constraint. For example, the expression constraint below represents the set of bone fractures that have no additional defining attributes (besides

Concept
ShowPartsterm
t363698007 |Finding site|
 and
Concept
ShowPartsterm
t16676008 116676008 |Associated morphology|
).

Scg expression
Borderridge
ShowFormatblock
	<< 125605004 |Fracture of bone| :
		[0..0] ((<<410662002 |Concept model attribute| MINUS 363698007 |Finding site|) 
			MINUS 16676008116676008 |Associated morphology|) = *

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Scg expression
Borderridge
ShowFormatblock
	(<<410662002 |Concept model attribute| MINUS 363698007 |Finding site|) MINUS 16676008116676008 |Associated morphology|

represents the set of attributes that must match the given refinement condition (in this case, these attributes must not appear in the concept definition of matching concepts due to the cardinality of [0..0]).

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