RFC 3958:Domain-Based Application Service Location...
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FLAG field

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2. Straightforward-NAPTR (S-NAPTR) Specification
... A NAPTR record with an empty FLAG field is "non-terminal" -- that is, more NAPTR ...
... RR lookups are to be performed. Thus, to process a NAPTR record with an empty FLAG field in S-NAPTR, the REPLACEMENT field is used as the target ...

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