...

	<< 404684003 |Clinical finding|:
		>> 24607500342752001 |CausativeDue agentto| = << 267038008 |Edema|

This expression constraint is represented in the long syntax as:

	descendantOrSelfOf 404684003 |Clinical finding|:
		ancestorOrSelfOf 42752001 246075003|CausativeDue agentto| = descendantOrSelfOf 267038008 |Edema|

...

When numeric concrete values (i.e. Integers and Decimals) are compared, a set of standard mathematical operators may be used. These mathematical operators are:

...

The following expression constraint is satisfied only by amoxicillin tablets, whose strength is oral medicinal products, which contain amoxicillin and have a presentation strength greater than or equal to 200 mg

.  

250 mg.

<763158003 |Medicinal product (product)|:
	411116001 |Has manufactured dose form (attribute)

	< 27658006 |Amoxicillin|:
		411116001 |Has dose form| = << 385055001385268001 |TabletOral dose form (dose form)|,
	{	{<< 179999999100127489000 |Has basisactive ofingredient strength(attribute)| = (<< 219999999102372687004 |Amoxicillin only(substance)|:,
 			1899999991031142135004 |Has presentation strength magnitude numerator value (attribute)| >= #200#250, 199999999101
		732945000 |Has presentation strength numerator unit (attribute)| = 258684004 |mg|)}milligram (qualifier value)|}	

Please note that, as per SNOMED CT Compositional Grammar, integer and decimal values are preceded by a hash character (e.g. "#500"), while string values are surrounded by double quotes (e.g. "PANADOL").

To find those capsules oral amoxicillin products that have a strength between 500 250 and 800 mg (inclusive), the following expression constraint may be used:

	< 27658006 |Amoxicillin<763158003 |Medicinal product (product)|:
		411116001 |Has manufactured dose form (attribute)| = << 385268001 |Oral 385055001dose |Tabletform (dose form)|,
	{	{<< 179999999100127489000 |Has basisactive ofingredient strength(attribute)| = (<< 219999999102372687004 |Amoxicillin only(substance)|:,
 			1899999991031142135004 |Has presentation strength magnitude numerator value (attribute)| >= #500#250, 
			1899999991031142135004 |Has presentation strength magnitude numerator value (attribute)| <= #800, 
			199999999101732945000 |Has presentation strength numerator unit (attribute)| = 258684004 |mg|)}milligram (qualifier value)|}	

Concrete values of type string and boolean may also be included in an expression constraint, and compared using an 'equal to' (i.e. "=") or 'not equal to' (i.e. "!=") operator. The following expression constraint is satisfied only by products with a trade product name equal to "PANADOL"

...

	< 373873005 |Pharmaceutical / biologic product|:
		2099999991043460481009 |Has tradeproduct name| = "PANADOL"                

The following expression constraint is satisfied only by products that are in the national benefit scheme (of the given country)

.

	< 373873005 |Pharmaceutical / biologic product|:
		859999999102 |Is in national benefit scheme| = TRUE

...

	descendantOf 91723000 |Anatomical structure|:
		reverseOf 363698007 |Finding site| = descendantOf 125605004 |Fracture of bone|

Anchor
DottedAttributes DottedAttributes

Dotted Attributes

An alternative way of representing 'reversed attributes' is by applying the dot notation to represented them as dotted attributes. Using this alternative notation, "

...

	< 125605004 |Fracture of bone|.363698007 |Finding site|

The next example below finds the set of substances, which are active ingredients of a 'TRIPHASIL tablet'an active ingredient in any product containing amoxicillin.

	< 105590001 |Substance|: 
		R << 127489000 |Has active ingredient| = < 24999999910127658006 |TRIPHASILProduct containing tabletamoxicillin|

This expression constraint is represented in the long syntax as:

	descendantOf 105590001 |Substance|: 
		reverseOfReverseOf descendantOrSelfOf 127489000 |Has active ingredient| = descendantOf 24999999910127658006 |TRIPHASILProduct containing tabletamoxicillin|

An equivalent way of representing this constraint, using the 'dot notation' is:

	< 105590001 |Substance| AND (249999999101 < 27658006 |TRIPHASILProduct containing tabletamoxicillin| . << 127489000 |Has active ingredient| )

or (using the

	249999999101< 27658006 |TRIPHASILProduct containing tabletamoxicillin| . << 127489000 |Has active ingredient|

...