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Parent Package: representation
Class ELEMENT

ITEM
   |
   +--ELEMENT
The leaf variant of ITEM, to which a DATA_VALUE instance is attached.

Attributes
Signature	Optionality	Multiplicity	Constant	Documentation
null_flavor : DV_CODED_TEXT	0..1	--		flavour of null value, e.g. indeterminate, not asked etc

Attributes from Associations
	Signature	Optionality	Multiplicity	Documentation
	value : DATA_VALUE	0..1	--	data value of this leaf
	value : DATA_VALUE	0..1	--

Operations
Signature	Constraints	Documentation
is_null() : Boolean		True if value logically not known, e.g. if indeterminate, not asked etc.

Constraints
Name	Expression
Null_flavour_valid	inv: is_null implies terminology(Terminology_id_openehr).has_code_for_group_id (Group_id_null_flavour, null_flavor.defining_code)
Null_flavor_indicated	inv: is_null xor null_flavour <> Void
Is_null_valid	inv: is_null = (value = Void)