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