Purpose

An allows to be associated with components for any specified purpose.

Data structure

An used to apply text to selected .

Field	Data type	Purpose
		A 128 bit unsigned , uniquely identifying this . Different versions of a reference set member share the same but have different . This allows a reference set member to be modified or made (i.e. removed from the active set) at a specified time.
		The inclusive date or time at which this version of the identified became the current version. The current version of this at time T is the version with the most recent prior to or equal to time T .
		The state of the identified as at the specified . If = 1 (true) the is part of the current version of the set, if = 0 (false) the is not part of the current version of the set.
		Identifies the that contains this as at the specified . The value must be a of within the metadata .
		Identifies the to which this belongs. In this case, set to .
		The identifier of the to be annotated.
		The text to attach to the identified by .

Metadata

The following metadata in supports this :

Descriptor template

The tables below show the descriptors that define the structure of the pattern and examples of the descriptors for specific that follow this pattern.

refsetId	referencedComponentId	attributeDescription	attributeType	attributeOrder
				0
				1

The for the Annotation field can be any of the " string " in the metadata . This is described in more detail under the " descriptor" section.

The table below holds the Descriptor for the "Associated image" , which allows URLs to be associated with :

refsetId	referencedComponentId	attributeDescription	attributeType	attributeOrder
				0
				1

Note that in the table above, the is a of | string | in the metadata.

Note: The tables above omit the initial four columns of data present in the release file. These follow the standards versioning pattern , , , . Additionally, to aid understanding, the tables above also show the from one of the associated with each of the identified . The release file only contains the .

Annotation reference set example

As no annotation reference sets are included in the International Release, these sample rows are for illustration only.

refsetId	referencedComponentId	Annotation
		http://en.wikipedia.org/wiki/Heart#mediaviewer/File:Wiki_Heart_Antomy_Ties_van_Brussel.jpg
		http://www.educationaldimensions.com/eLearn/endoscope/bigScope.html

In the above example, the two URLs have been used to annotate two with images on the web. It is not recommended that this mechanism be used to annotate with text that may require translation to other . Instead, such text should be included under an appropriate type within the .

Note: The tables above omit the initial four columns of data present in the release file. These follow the standards versioning pattern , , , . Additionally, to aid understanding, the tables above also show the from one of the associated with each of the identified . The release file only contains the .