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include metadata that metadatathat represent each of the allocated . The representing the namespaces are arranged in a single parent hierarchy, as follows: allocated 

Ahas the following characteristics:

• It is aof

  Scg expression
  ShowParts id+term
  370136006|Namespace concept

  |

  Scg expression
  ShowParts id+term
  373872000|Core Namespace|

• Scg expression
  ShowParts term
  |Extension Namespace A {}|

Scg expression
ShowParts term
|Extension Namespace B {}|

• Scg expression
  ShowParts term
  |Extension Namespace D {}|

Scg expression

ShowParts	term

|Extension Namespace E {}

|

• Scg expression
  ShowParts term
  |Extension Namespace C {}|

...

• .

...

In the above hierarchy,

|Extension Namespace A {}|

|Extension Namespace B {}|

|Extension Namespace C {}|

373872000|Core Namespace|

|Extension Namespace B {}|

|Extension Namespace D {}|

|Extension Namespace E {}|

Each may only have one parent in the

370136006|Namespace concept|

The namespace hierarchy is used to constrain which content can be promoted from one to another without amending the SCTID (data type). Content may be moved (without amendment of SCTID (data type)) from an released by the owner of a child namespace to an released by the owner of a parent (or ancestor) namespace, as described by the |

370136006|Namespace concept|

...

• Theof thehas the term 

  • Extension Namespace {nnnnnnn} (namespace concept) 

• Aassociated with eachhas the term 

  • Extension Namespace {nnnnnnn}

• Where appropriate furthermay be included to identify the nature of the responsible organization.

...

1. A with an SCTID (data type) that includes

   Scg expression
   ShowParts term
   |Extension Namespace D {}|

   may be moved to the maintained by the owner of

   Scg expression
   ShowParts term
   |Extension Namespace B {}|

   without changing its SCTID (data type) , because this is a parent of the originating namespace.
2. A with an SCTID (data type) that includes

   Scg expression
   ShowParts term
   |Extension Namespace D {}|

   must not be moved to the maintained by the owner of

   Scg expression
   ShowParts term
   |Extension Namespace C {}|

   because this is not parent (or ancestor) of the originating namespace. Therefore, to make this move the original must be inactivated and replaced by a new component with a new SCTID (data type) in target namespace.
3. Any may be moved from any to the (subject only to formal acceptance that is a valid addition for international use).

have the following characteristics:

• They are (either children or ) of

  Scg expression
  ShowParts id+term
  370136006|Namespace concept|

  .
• The of each has the form Namespace {nnnnnnn} ( ) where nnnnnnn is the seven digit Namespace- .
• A associated with each has the form Namespace nnnnnnn
• Where appropriate further may be included to identify the nature of the responsible organization .

When requesting a from , there will be a facility to optionally specify a parent for the new namespace.

To specify a parent namespace for an existing , please contact with details of your existing and its proposed parent .

CAUTION:

Once a has be allocated a parent in this hierarchy, further changes to this hierarchical are not permitted. This restriction is imposed to avoid changes that would undermine traceability of moves between namespaces.