I've tried to create a draft of blockette 1002 structure that is based
on the mseed3 strawman and proposals.
* Variable length "stream ID" would allow to extend the length of
individual fields in the future as needed and even add additional fields
such as deployment ID. It is assumed that the general NSLC concept
remains, though (eg., a "stream ID" would not be a number or a URL). The
fields are to be formatted the same way as opaque header fields (see