How to use nsupdate to create NAPTR record

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http://serverfault.com – What's a working example for creating a NAPTR record using nsupdate against Bind9? man nsupdate sais: update add {domain-name} {ttl} [class] {type} {data...} Adds a new resource record with the specified ttl, class and data. But I can't seem to find the correct format for NAPTR My attempt: echo -e 'update add enum.example.com 60 IN NAPTR"u"."E2U+sip"."!^.*$![email protected]!" .'"\nsend"|nsupdate results in: invalid rdata format: not a valid number syntax error (HowTos)