Location of Core Properties Part

The location of the Core Properties part within the package is determined by traversing a well-defined package relationship as listed in Annex F, “Standard Namespaces and Content Types”. The format designer shall specify and the format producer shall create at most one core properties relationship for a package. A format consumer shall consider more than one core properties relationship for a package to be an error. If present, the relationship shall target the Core Properties part. [M4.1]