h the AIP. 
Hierarchical schemes of description can allow some descriptive elements to be associated 
with many items. 
AUDIT AND CERTIFICATION OF TRUSTWORTHY DIGITAL REPOSITORIES 
CCSDS 652.0-M-1 
Page 4-24 
September 2011 
4.5.3 The repository shall maintain bi-directional linkage between each AIP and its 
descriptive information. 
Supporting Text 
This is necessary to ensure that all AIPs can be located and retrieved. 
Examples of Ways the Repository Can Demonstrate It Is Meeting This Requirement 
Descri