TElDeltaCRLIndicatorCRLExtension is a descendant of TElCRLExtension class.
This extension contains delta CRL indicator.
The following paragraph is taken from RFC 2459 (Housley, et. al.), part 5.2.4:
«The delta CRL indicator is a critical CRL extension that identifies a delta-CRL. The use of delta-CRLs can significantly improve processing time for applications which store revocation information in a format other than the CRL structure. This allows changes to be added to the local database while ignoring unchanged information that is already in the local database.
When a delta-CRL is issued, the CAs MUST also issue a complete CRL. »