Page History

It is also possible to nest

Gloss
PreSpace false t expressions

, one inside the other. Any valid

Gloss
SpacePreSpace truefalse t expression

may be enclosed in a pair of brackets, and included as the value of an attribute in another

Gloss
PreSpace false t expression

. For example, the following

Gloss
SpacePreSpace truefalse t expression

describes a medication product that has a single dose form, which is both a spray and a suspension:

...

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

Gloss
PreSpace false t expression

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

The following examples show how complex

Gloss
SpacePreSpace truefalse t expressions

may be build up from simple ones, a layer at a time. This first

Gloss
SpacePreSpace truefalse t expression

describes a left hip structure:

...

This next expression uses the "left hip"

Gloss
SpacePreSpace truefalse t expression

above to describe a procedure to replace it:

...

Applying a further grouped

Gloss
SpacePreSpace truefalse t refinement

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

Gloss
t canonical representation

of

GlosTerm canonical form

 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
Border ridge ShowFormat block
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 above

Gloss
SpacePreSpace truefalse t expression

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.

...