DNS Flag signification in Syslog

[Mik J]

Hello,
Do you know where I can find the signification of DNS syslog messages ?
client x.x.x.x#64111 (webmail.google.NET): query: webmail.google.NET IN AAAA + (y.y.y.y)=> I'm looking for the signification of the +
client z.z.z.z#39953 (www.mydomain.org): query: www.mydomain.org IN A -ED (y.y.y.y)=> I'm looking for the signification of the -EC
Thank you
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