```
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. Empty elements in the result of split, such as when a dot is
+at the beginning or at the end of the key, or there are
+consequitive dots, are diagnosed as erroneous data.
```
"map": { "www.uk": { "alias" : "www.example.co.uk" }
}
```
+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