Two or more
may be combined to form a new
by joining them with the "+" symbol. This is particularly useful where both concepts
are primitive. The resultant
is the
of each of the
in the
. The resultant
below represents a drug dose form that is both a spray and a suspension.
421720008|spray dose form| + 7946007 |drug suspension|
Although not stipulated by the syntax, the two
joined in this way must (in nearly every case) come from the same top 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 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 + 7946007 |drug suspension|
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 suspension|
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