olemus
ISO/IEC 9594:
sertifitseerimisorganilt teisele sertifitseerimisorganile väljaantud sertifikaat
= a certification authority (CA) certificate where the issuer and the subject are different CAs

NIST:
sertifikaat usaldussuhte loomiseks kahe sertifitseerimisorgani vahel
= a certificate used to establish a trust relationship between two certification authorities

ülevaateid
http://www.oasis-pki.org/pdfs/Understanding_Path_construction-DS2.pdf

https://info.publicintelligence.net/CCEB-PKI.pdf