Create a NSEC record
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cur_owner: the current owner which should be taken as the starting point
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next_owner: the rrlist which the nsec rr should point to
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rrs: all rrs from the zone, to find all RR types of cur_owner in
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Returns a ldns_rr with the nsec record in it
AUTHOR
The ldns team at NLnet Labs. Which consists out of
Jelte Jansen and Miek Gieben.