Two or more may moremay be combined to form a new by new by joining them with the "+" symbol. This is particularly useful where both concepts are primitive. The resultant is the of resultantis theof each of the in the thein the. The resultant below resultant below represents a drug dose form that is both a spray and a suspension.
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421720008| |
spray 7946007 drug Although not stipulated by the syntax, the
two joined twojoined in this way must (in nearly every case) come from the same top
level level. 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 in the should whichin theshould 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:
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421720008 + |
7946007 drug The syntax allows spaces, tabs and carriage returns in most places. The following example has an identical meaning to the one above:
drug | Scg expression |
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421720008 + 7946007 | 421720008
+ 7946007
|Drug suspension| |