Relationships Part

Each set of relationships sharing a common source is represented by XML stored in a Relationships part. The Relationships part is URI-addressable and it can be opened, read, and deleted. The Relationships part shall not have relationships to any other part. Package implementers shall enforce this requirement upon the attempt to create such a relationship and shall treat any such relationship as invalid. [M1.25]

The content type of the Relationships part is defined in Annex F, “Standard Namespaces and Content Types".