What is Annotation?

An annotation object, illustrated at right, represents
incidental information that can be attached to an object for the
purpose of annotating or footnoting that object. You can associate
annotations with custom objects, documents, and folders.
Annotations:
• Are independently securable. Default security is provided by
the class and by the annotated object. An annotation can
optionally have a security policy assigned to it.
• Can have subclasses.
• Can have zero or more associated content elements, and the
content need not have the same format as its annotated
object.
• Are uniquely associated with a single document version, and
thus are not versioned when a document version is updated.
• Can be modified and deleted independently of the annotated object.
• Can be searched for and retrieved with an ad hoc query.
• Can subscribe to server-side events that fire when an action (such as creating an annotation) occurs.
• Can participate in a link relationship.
• Can be audited.