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Two or more

Gloss
SpacePreSpacetruefalse
tconcepts
may be combined to form a new
Gloss
PreSpacefalse
tconcept
 by joining them with the "+" symbol. This is particularly useful where both concepts are primitive. The resultant
Gloss
SpacePreSpacetruefalse
texpression
is the
Gloss
SpacePreSpacetruefalse
tchild
of each of the
Gloss
SpacePreSpacetruefalse
tconcepts
in the
Gloss
PreSpacefalse
texpression
. The resultant
Gloss
PreSpacefalse
texpression
 below represents a drug dose form that is both a spray and a suspension.

...

Although not stipulated by the syntax, the two

Gloss
SpacePreSpacetruefalse
tconcepts
joined in this way must (in nearly every case) come from the same top level
Gloss
PreSpacefalse
thierarchy
. 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

Gloss
SpacePreSpacetruefalse
tconcepts
in the
Gloss
SpacePreSpacetruefalse
texpression
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|
ShowFormatinline
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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