Compositional Grammar

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New attributes that are added to the SNOMED CT concept model (or to a SNOMED CT extension) may require their value to be concrete. Concrete values include integers (e.g. 500), decimals (e.g. 2.75), strings (e.g. "PANADOL"), and booleans (e.g. TRUE1 .

The expression shown below uses both concept values and concrete values to represent a product containing precisely 500 milligram amoxicillin per oral tablet. In this case, the dose form, the active ingredient, the basis of strength substance, and the strength unit all use a concept as their value, while the strength numerator and denominator are represented using a numeric value. Furthermore, the |Count of base of active ingredient| also uses a numeric value, and represents the number of substances that is the part of the ingredient that the strength of a given product is based upon. The numeric values are indicated in the expression by the preceding '#' symbol (e.g. #500).

  778317004 |Product containing only amoxicillin in oral dose form (medicinal product form)|  :
         411116001 |Has manufactured dose form (attribute)|  =  421026006 |Conventional release oral tablet (dose form)| , 
         763032000 |Has unit of presentation (attribute)|  =  732936001 |Tablet (unit of presentation)| , 
         1142139005 |Count of base of active ingredient (attribute)|  = #1, 
         766939001 |Plays role (attribute)|  =  787994008 |Antibacterial therapeutic role (role)|
            {  762949000 |Has precise active ingredient (attribute)|  =  372687004 |Amoxicillin (substance)| , 
               732943007 |Has basis of strength substance (attribute)|  =  372687004 |Amoxicillin (substance)| , 
               1142135004 |Has presentation strength numerator value (attribute)|  = #500, 
               732945000 |Has presentation strength numerator unit (attribute)|  =  258684004 |milligram (qualifier value)| , 
               1142136003 |Has presentation strength denominator value (attribute)|  = #1, 
               732947008 |Has presentation strength denominator unit (attribute)|  =  732936001 |Tablet (unit of presentation)|  }
The expression below represents a medicinal product that contains precisely chlorhexidine diacetate 10 milligrams per gram conventional release cutaneous powder.
    778726003 |Product containing only chlorhexidine in cutaneous dose form (medicinal product form)|  :
         411116001 |Has manufactured dose form (attribute)|  =  385112003 |Conventional release cutaneous powder (dose form)| , 
         1142139005 |Count of base of active ingredient (attribute)|  = #1
            {  762949000 |Has precise active ingredient (attribute)|  =  96317008 |Chlorhexidine diacetate (substance)| , 
               732943007 |Has basis of strength substance (attribute)|  =  96317008 |Chlorhexidine diacetate (substance)| , 
               1142138002 |Has concentration strength numerator value (attribute)|  = #10, 
               733725009 |Has concentration strength numerator unit (attribute)|  =  258684004 |milligram (qualifier value)| , 
               1142137007 |Has concentration strength denominator value (attribute)|  = #1, 
               733722007 |Has concentration strength denominator unit (attribute)|  =  258682000 |gram (qualifier value)|  }
Boolean and string-based concrete values may also be used2 . For example, the expression below represents a tablet containing 500 mg of paracetamol with a trade name (or brand name) of "PANADOL"3 .
And the expression below represents an Irbesartan 150 mg tablet that is eligible for reimbursement through the national benefit scheme (of the given country)4 .

Footnotes
Ref Notes
1 Boolean values are not permitted in the SNOMED CT International edition.
2 Boolean and string-based concrete values should be used with caution. Care must be taken to only use these in situations in which the clinical meaning cannot be adequately defined using a concept value.
3 Concrete values of type string are case sensitive and compared using the Unicode Collation Algorithm (http://www.unicode.org/reports/tr10/).
4 The concept 859999999102 | is in national benefit scheme | is a fictitious attribute used here to illustrate boolean values.

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