Structure of a network entry in sourcetable.

Count	Element	Description	Content
1	type	Indicator of a network description	Content: NET
2	identifier	Network Identifier - Name of station network	Text
3	operator	Name of institution or company operating the network	Text
4	authentication	access protection for data strames None (N), Basic (B) or Digest (D)	Content: B, D, N or a comma seperated list of these
5	fee	User fee for data access: yes (Y) or no (N)	Content: Y or N
6	web-net	Web address for network information	URL
7	web-str	Web address for stream information	URL
8	web-reg	Web or mail address for registration	URL or e-mail
9	misc	Miscellaneous information	Text