Hi Gong!
And I still have some questions to be clarified. I've downloaded
"class_level_lod_constellation.csv", which gives relations between
ontologies rather than between classes. Are there any class-level mappings
available? And, how do you obtain such mappings? Is it just based on
explicitly stated axioms in ontologies, or based on any ontology matching
algorithms?
The goal is to have a general overview of connectiveness of ontologies
one between the other. This schema doesn't and won't shows all the
actual connections.
So all connections between these ontologies are defined in the
ontologies themselves. And for example, its connections with external
ontologies is defined in this file that Mike was talking about:
http://umbel.org/ontology/umbel_external_ontologies_linkage.n3
As simple as this :)
About the methods to create these linkages: multiple methods exists
depending on the use cases and the ontologies we have to handle.
These methods are mostly semi-automatic. Sometimes fully automatics.
With multiple steps such as evaluation of consistency and quality control.
Take care,
Fred
