Due to the diversity of samples that the IGSN accommodates, including historic samples with a very limited set of available metadata, there are two types of IGSN metadata: registration metadata and descriptive metadata. Registration metadata are used only to transmit the core metadata elements needed for the registration, resolution, and administration of the IGSN resolver service. Metadata for sample catalogues use descriptive metadata. The IGSN e.V. has defined a core descriptive metadata set, but community databases may define more specific metadata profiles used by their respective scientific communities.
The registration metadata schema can be downloaded from our code repository: (Trac) https://github.com/IGSN/metadata/tree/master/registration.
The metadata and schema are documented at https://github.com/IGSN/metadata/wiki.
An IGSN Community can define a more detailed metadata application profile.