OID value: 2.6.1.5.1
OID description:
The Languages heading extension identifies the languages
used in the composition of the IPM's Subject heading field
and Body. The extension comprises a Set of zero or more
Printable Strings, each one of the two-character language
codes identified by ISO 639[.2|].
If the extension is absent from the Extensions heading field
or no languages are indicated, the languages shall be
considered unspecified.
Enter new OIDs into the lists