For data that are accessible via the network we define
four levels of interoperability at the data level:
- Level 0 - no syntactic or
semantic metadata - FTP.
- Level 1 - rigid syntactic,
no semantic metadata - DODS.
- Level 2 - rigid syntactic,
human readable semantic metadata - A subset of DODS data
sets.
- Level 3 - rigid syntactic,
consistent semantic metadata; i.e., machine readable -
A subset of the DODS Level 2 data sets.