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Two or more

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SpacePreSpace truefalse t concepts

may be combined to form a new

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PreSpace false t concept

 by joining them with the "+" symbol. This is particularly useful where both concepts are primitive. The resultant

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SpacePreSpace truefalse t expression

is the

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SpacePreSpace truefalse t child

of each of the

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SpacePreSpace truefalse t concepts

in the

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PreSpace false t expression

. The resultant

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 below represents a drug dose form that is both a spray and a suspension.

...

Although not stipulated by the syntax, the two

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SpacePreSpace truefalse t concepts

joined in this way must (in nearly every case) come from the same top level

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. A rare exception to this rule is those expressions which refer to products that are both drugs and devices, and are therefore descendants of both 373873005 |pharmaceutical / biologic product| and 260787004 |physical object|.

The syntax does not mandate which

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SpacePreSpace truefalse t concepts

in the

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SpacePreSpace truefalse t expression

should have associated terms and which should not, so it is valid (although not advisable) to mix and match. For example, the following syntax is valid:

Concept
t 421720008 + 7946007|Drug suspension| ShowFormat inline

The syntax allows spaces, tabs and carriage returns in most places. The following example has an identical meaning to the one above:

Concept
t 421720008 + 7946007 |Drug suspension|

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