The catalogue serves as the lookup table for prefix mappings. Given a CURIE prefix, the catalogue should return its base URL such that the user could perform the expansion to a URL.
For example, a link to the country of birth could be expressed as:
[ ("name", "Alan Turing") , ("born-in", "country:GB") ]
Or a link of an allergen to its group which is part of the same dataset:
[ ("name", "Walnut") , ("group", "allergen:24") ]