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- Map label to location: Perform a lookup for a resource labeled uniquely by URI (or IRI) and return the associated URLs (or IDNs) required to be resolvable internet locations for:
- the primary site and any mirror sites for the resource itself (a mapping via the associated URLs from the URI label to the resource itself),
- the URI (or IRI) namespace directory containing associated metadata maintained by the resource owner with descriptions in RDDL (a more indirect mapping via the associated URLs from the URI label to the metadata at the namespace directory linking to the resource), or
- the contact information maintained by the governing PORTAL registry if neither the resource itself nor its URI namespace is maintained online by the resource owner (the most indirect mapping via the associated URL from the URI label to the metadata at the registry enabling contact with the owner of the offline resource).
- Map tag to location: Perform a lookup for a resource labeled uniquely by tag and return the associated URI and URLs subject to the constraint restricting the lookup to those resources governed by PORTAL registries of the same specific registry type with a policy that imposes uniqueness of a principal tag.
- Search non-semantic strings in labels or tags:Find resources by string query of character substrings in labels or tags and return the associated URIs and URLs recognizing that the search may yield non-unique results when performed across resources governed by registries of different registry types or of the same registry type without a policy imposing at least one unique tag.
- Search semantic statements in descriptions: Find resources by semantic query with SPARQL of semantic statements in descriptions and return the associated URIs and URLs recognizing that the search may yield unranked non-unique results.
- Provide identification and authentication: Include the provenance and signature of each resource record returned in the response to the lookup or query request.
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