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Background
X.509 (2009) working on PMI interworking between domains
Defining several new AC extensions for role mappings, attribute hierarchies etc.
Needs an extension to point to the superior in a PMI delegation chain
AIA is the obvious choice, and this is being used by VOMS in the grid world
Last ITU-T meeting in Jeju (May 2006) issued a liaison statement to PKIX group asking if AIA can be used for ACs
PPT Version