The digital signature parts consist of the Digital Signature Origin part, Digital Signature XML Signature parts, and Digital Signature Certificate parts. Relationship names and content types relating to the use of digital signatures in packages are defined in Annex F, “Standard Namespaces and Content Types.”
example:
Figure 12–1 shows a signed package with signature parts, signed parts, and an X.509 certificate. The example Digital Signature Origin part references two Digital Signature XML Signature parts, each containing a signature. The signatures relate to the signed parts.
