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It is also possible to nest

Gloss
texpressions
, one inside the other. Any validmay valid
Gloss
Spacetrue
texpression
may be enclosed in a pair of brackets, and included as the value of an attribute in another
Gloss
texpression
. For example, the followingdescribes following
Gloss
Spacetrue
texpression
describes a medication product that has a single dose form, which is both a spray and a suspension:

Scg expression
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   373873005 |Pharmaceutical / biologic product|:
      411116001|Has dose form| = (421720008|Spray dose form| + 7946007 |Drug suspension|)

In the example above, note the use of round brackets (i.e. "( )") to identify a nested

Gloss
texpression
, as opposed to braces (i.e. "{ }"), which is used to identify attribute groups.

The following examples show how complexmay complex

Gloss
Spacetrue
texpressions
may be build up from simple ones, a layer at a time. This firstdescribes first
Gloss
Spacetrue
texpression
describes a left hip structure:

Scg expression
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   24136001|Hip joint structure|:
      272741003|Laterality| = 7771000|Left|

This next expression uses the "left hip"

Gloss
Spacetrue
texpression
above to describe a procedure to replace it:

Scg expression
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   397956004|Prosthetic arthroplasty of the hip|:
      363704007|Procedure site| = (24136001|Hip joint structure|: 
         272741003|Laterality| = 7771000|Left|)

Applying a further groupedto grouped

Gloss
Spacetrue
trefinement
to the above describes a procedure to replace a left hip by inserting a prosthesis. Note that this example mixes an ungrouped qualification and a grouped qualification. Where this is done, the canonical representation of the expression includes all ungrouped attributes before the grouped ones (see  Terminology Services Guide for more details). Please also note that in the previous version of this standard a comma was not permitted between the last ungrouped attribute and the first attribute group – however this comma is now optional to avoid unexpected syntax errors.

Scg expression
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   397956004|Prosthetic arthroplasty of the hip|: 
      405814001|Procedure site - indirect| = (24136001|Hip joint structure|: 272741003|Laterality| = 7771000|Left|), 
      { 363699004|Direct device| = 304120007|Total hip replacement prosthesis|, 
        260686004|Method| = 425362007|Surgical insertion - action|}

Finally, the abovemay above

Gloss
Spacetrue
texpression
may be included within a contextual wrapper, to describe a procedure that has been performed on a patient to replace a left hip by inserting a prosthesis.

Scg expression
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   243796009|Situation with explicit context|: 
   { 408730004|Procedure context| = 385658003|Done|, 
     408731000|Temporal context| = 410512000|Current or specified|,
     408732007|Subject relationship context| = 410604004|Subject of record|, 
     363589002|Associated procedure| = 
     ( 397956004|Prosthetic arthroplasty of the hip|: 
          405814001|Procedure site - indirect| = (24136001|Hip joint structure|:
             272741003|Laterality| = 7771000|Left|)
          { 363699004|Direct device| = 304120007|Total hip replacement prosthesis|,
            260686004|Method| = 425362007|Surgical insertion - action|} ) }

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