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CDP in self signed root CA



We are building a certificate hierarchy with 4 (CA) layers. We want to include a CDP extension in every CA and end user certificate. At the moment we have a discussion about the need for a CDP extension in the Root CA. The argument against it is that it doesn't make sense because there is no supperior CA that can sign the CRL. The argument for a CDP is that for performing a correct path validation the CRL for every CA (including the Root CA) and end-user certificate should be validated.
 
I scanned through RFC 3280, but it doesn't say anything about it. Does anybody have suggestions?
 
Greetings,
 
Erwan Smits