#### map attribute
-FIXME - explain handling of the keys with dots.
-Also, add checks to the code to disallow empty elements.
-
JSON Map object containing subdomain names as its keys and domain
objects as values. Element of the map with empty key "" has special
meaning: the value of this map element is merged into the current
the current object.
```
-"map": { "www": { "alias" : "www.example.com." }
+"map": { "www": { "alias" : "www.example.com" }
, "www2": { "delegate": "d/example" }
}
```
+Note: When a key contains dots ".", it is converted to a nested
+map. If empty element appears as a result of split, such as when
+a dot is at the beginning or at the end of the key, or there are
+consequitive dots, such elemets are ignored. For example,
+
+```
+"map": { "www.uk": { "alias" : "www.example.co.uk" }
+ , "www..us": { "alias" : "www.example.com" }
+ , "smtp.us.": { "alias" : "smtp.example.com" }
+```
+
+is equivalent to
+
+```
+"map": { "uk": { "map": { "www": { "alias" : "www.example.co.uk" }}}
+ , "us": { "map": { "www": { "alias" : "www.example.com" }
+ , "smtp": { "alias" : "smtp.example.com" }}
+ }
+ }
+```
+
#### fingerprint attribute
Does not translate into any DNS RR. Contains a list of TLS
}
```
+translates into:
+
+```
+_443._tcp TLSA (3 0 1 660008F9...7621B787)
+_25._tcp TLSA (3 0 1 660008F9...7621B787)
+```
+
+The third element of the `TlsObj` heterogenous array is an extention
+to the DANE definition. Value `0` means that this rule is not enforced
+upon subdomains, value `1` means that it is enforced on subdomains.
+Rule defined inside a subdomain `DomObj` that specifies `0` on a rule
+existing in upper domain, that specifies `1` should be ignored. I.e.
+subdomain rule cannot revoke enforcement imposed by an upper domain rule.
+
#### ds attribute
Translates into `DS` RR. Carries attributes defined by