User:Andreas Plank/CETAF Stable Identifier Handbook
Contents
How can I implement CETAF Stable Identifiers for my collection?
The CETAF Stable Identifiers can be implemented in three levels. They are described in detail in herbal.rbge.info’s documentation. Following conditions have to be met to reach the corresponding implementation levels:
Level 1
- you assigned a stable URI to each object of your collection, which will be never changed and preferably follows the best practices for stable URIs
- there exists a human-readable representation (web-page) for each of your collection objects
- a user trying to access a collection object by typing the stable URI of it into a web-browser will be redirected to the human-readable representation (web-page) of the object (you can test this by using the CETAF URI Tester)
Level 2
- you reached level 1
- there exists a machine-readable RDF metadata record for each of your collection objects
- a machine trying to access a collection object via its identifier with '
application/rdf+xml
' header will be redirected to the objects machine-readable RDF metadata record (you can test this by using the CETAF URI Tester)
Level 3
- you reached level 2
- the machine-readable RDF metadata record of each of your collection objects encodes application specific data (e.g. is compliant to the CETAF Specimen Preview Profile—CSPP)
HTTP vs. HTTPS versions of CETAF URIs
As far as the Semantic web is concerned http://xyz and https://xyz are different things because they are different URIs. The recommendation for new implementations should be just to use HTTPS. If you have only HTTP or HTTPS versions, or want to change it you should take notice of the following:
HTTP | HTTPS |
---|---|
You
|
You
|
Want to change HTTP to HTTPS | |
You
|
Publishing CETAF IDs to GBIF
If your institution is using CETAF IDs and yout want them (and potential Specimen RDF) to be included into the CETAF Specimen Catalogue, they need to be used as GUIDs in the specimen data fed to GBIF. As described in CETAF Specimen Catalogue, the GBIF Index is used to discover CETAF IDs.
- If DarwinCore is used, the IDs must be mapped to occurrence ID.
- For ABCD, the concept UnitGUID should be used.
How can I discover specimens with CETAF IDs and corresponding LOD?
You can discover specimens of institutions of the Stable Identifiers Implementers Group by using the CETAF Specimen Catalogue maintained at the BGBM, which offers a web service for getting a list of valid CETAF IDs. For implementers of level 2, who provide RDF representations of their specimens, a cache triple store with a SPARQL access point will be available soon.