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• Expression constraints may be used to constrain replacement slots of type id and scg,
• Value list constraints may be used to constrain replacement slots of type tok, str, int and dec,, dec and bool.
• Range constraints may be used to constrain replacement slots of type int and dec.

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Value list constraints can be used to constrain the possible values that may replace slots of type tok, str, int and , dec and bool.

For example, the following expression template uses a value list constraint to specify the possible definitionStatus tokens that may be used. The slot in this expression template may be replaced with either the token "<<<" or the token "===". 

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The expression template below uses a value list constraint to constrain the value of the slot to the string "PANADOL", the string "TYLENOL", or the string “HERRON”.

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	322236009 |Paracetamol 500mg oral tablet|: 209999999104774167006 |Has tradeProduct name (product name)| = [[+str ("PANADOL" "TYLENOL" "HERRON")]]

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	322236009 |Paracetamol 500mg oral tablet|: 209999999104774167006 |Has tradeProduct name (product name)| = "PANADOL"

	322236009 |Paracetamol 500mg oral tablet| : 209999999104774167006 |Has tradeProduct name (product name)| = "TYLENOL"

	322236009 |Paracetamol 500mg oral tablet|: 209999999104774167006 |Has tradeProduct name (product name)| = "HERRON"

In the next example, a value constraint is used to constrain a replacement slot of type int. In this case, the slot may be replaced by the integer values 10, 20 or 30. 

	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|:
	{ 7499999991081142142004 |Has pack size magnitude(attribute)|  = [[+int (#10 #20 #30)]], 
		759999999106774163005 |Has pack size unit units(attribute)|  =  428641000 |Capsule| }

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	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|:
		{ 7499999991081142142004 |Has pack size magnitude(attribute)| = #10, 
			759999999106774163005 |Has pack size unit units(attribute)| = 428641000 |Capsule| }

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	417720003 |Zinc 323510009 |Amoxycillin 500mg25mg oral capsule|: 
      { 7499999991081142142004 |Has pack size magnitude(attribute)| = #20, 
        759999999106774163005 |Has pack size unit units(attribute)| = 428641000 |Capsule| }

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	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|: 
		{ 7499999991081142142004 |Has pack size magnitude(attribute)| = #30, 
			759999999106774163005 |Has pack size unitsunit (attribute)| = 428641000 |Capsule| }

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Range constraints can be used by slots of type int or dec to constrain the permitted replacement values. Range constraints may specify the minimum permitted value, the maximum permitted value, or both. By default, ranges are inclusive (that is, the range includes the stated minimum and maximum values). However exclusive ranges (in which the stated minimum or maximum is not itself allows as a value) may be specified.

For example, the following expression template allows any pack size to be used that is between 20 and 30 capsules (inclusive).

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	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|:
		{ 7499999991081142142004 |Has pack size magnitude(attribute)| = [[+int (#20..#30)]], 
			759999999106774163005 |Has pack size unit units(attribute)|  = 428641000 |Capsule| }

To specify exclusive minimum values, a greater than sign (‘>’) is placed before the minimum value, and to specify exclusive maximum values, a less than sign (‘<’) is placed before the maximum value. For example, the following expression template allows any pack size that is between 20 and 30 capsules (exclusive). This range constraint is equivalent to an inclusive range of 21..29.

	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|:
		{ 7499999991081142142004 |Has pack size magnitude(attribute)| = [[+int (>#20..<#30)]],
			759999999106774163005 |Has pack size unit units(attribute)|  = 428641000 |Capsule| }

Multiple ranges may be specified in a single range constraint. When multiple ranges are specified, these should be interpreted as alternative ranges. For example, the expression template below permits any pack size between 10 and 20 capsules (inclusive), or between 30 and 40 capsules (inclusive). This template does not, for example, permit a pack size between 21 and 29 capsules. 

	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|:
		{ 7499999991081142142004 |Has pack size magnitude(attribute)| = [[+int (#10..#20 #30..#40)]], 
			759999999106774163005 |Has pack size unit units(attribute)|  = 428641000 |Capsule| }

When a minimum value is required with no maximum, it is possible to omit the maximum value in a range constraint. For example, the expression template below permits any pack size greater than or equal to 20 capsules.

	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|:
		{ 7499999991081142142004 |Has pack size magnitude(attribute)| = [[+int (#20..)]],
			759999999106774163005 |Has pack size unit units(attribute)|  = 428641000 |Capsule| }

Similarly, it is also possible to state a maximum without a minimum constraint. For example, the expression template below permits any pack size less than or equal to 20 capsules. It should be noted that without a concept model rule to ensure that all pack sizes are greater than zero, this template will, by default, allow a pack size of zero or a negative pack size to be defined.

	323510009417720003 |AmoxycillinZinc 25mg 500mgoral capsule|:
		{ 7499999991081142142004 |Has pack size magnitude(attribute)| = [[+int (..#20)]],
			759999999106774163005 |Has pack size unit units(attribute)|  = 428641000 |Capsule| }