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Two or moremay more

Gloss
Space true t concepts

may be combined to form a new by new

Gloss
t concept

 by joining them with the "+" symbol. This is particularly useful where both concepts are primitive. The resultantis theof each of thein the. The resultant below resultant

Gloss
Space true t expression

is the

Gloss
Space true t child

of each of the

Gloss
Space true t concepts

in the

Gloss
t expression

. The resultant

Gloss
t expression

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

Scg expression
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421720008|Spray dose form| + 7946007|Drug suspension|

Although not stipulated by the syntax, the twojoined two

Gloss
Space true t concepts

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

Gloss
t hierarchy

. 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 whichin theshould which

Gloss
Space true t concepts

in the

Gloss
Space true 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: 421720008 +

Scg expression
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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: 421720008 + 7946007 |Drug

Scg expression
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Concept
t 421720008 + 7946007 |Drug suspension|

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