sun.security.x509 classes that are components of a certificate define an IDENT
variable that contains the "path" to that class's value in a certificate.

This variable is never used and prevents re-use of a class that supports an
ASN.1 structure in more than one context (for example:
CertificateIssuerUniqueIdentity and CertificateSubjectUniqueIdentity are
almost identical).