Uniquely identifies an attachment.
<AttachmentID> <extension base="uid"> <attribute name="itemReference" type="boolean"/>
Specifies the unique identifier for the attachment.
Specifies that the attachment is an embedded item (such as, mail, appointment, task, or note). If the item is an itemReference, call getItemRequest
to retrieve the item. If the item is an attachment, call getAttachmentRequest
to retrieve the item.