service field
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... NAPTR record, the client examines the
SERVICE field to find a match. In the case of the S-NAPTR DDDS
application, this means a SERVICE field ...
... SERVICE field to find a match. In the case of the S-NAPTR DDDS
application, this means a SERVICE field that includes the tags for
the desired application service ...
...
while (not rr-done)
if ([SERVICE field of cur-rr contains desired application
service and application protocol ...
