[ CCode ( cname = "GST_TAG_EXTENDED_COMMENT" ) ]
public const string EXTENDED_COMMENT
key/value text commenting the data (string)
Must be in the form of 'key=comment' or 'key[lc]=comment' where 'lc' is an ISO-639 language code.
This tag is used for unknown Vorbis comment tags, unknown APE tags and certain ID3v2 comment fields.