Add infrastructure for annotating provider relationships

References #32 and #21

Author: cthoyt

src/bioregistry/data/bioregistry.json

@@ -567,7 +567,9 @@
       "is_identifiers": true,
       "is_obo": false,
       "prefix": "APID.INTERACTIONS"
-    }
+    },
+    "provides": "uniprot",
+    "type": "provider"
   },
   "apo": {
     "bioportal": {
@@ -23990,6 +23992,7 @@
     }
   },
   "validatordb": {
+    "example": "2h6o",
     "miriam": {
       "deprecated": false,
       "description": "Database of validation results for ligands and non-standard residues in the Protein Data Bank.",
@@ -24008,7 +24011,10 @@
       "is_identifiers": true,
       "is_obo": false,
       "prefix": "VALIDATORDB"
-    }
+    },
+    "provides": "pdb",
+    "type": "provider",
+    "url": "https://webchem.ncbr.muni.cz/Platform/ValidatorDb/ByStructure/$1"
   },
   "vandf": {
     "biolink": {

src/bioregistry/resolve.py

@@ -292,6 +292,36 @@ def get_owl_download(prefix: str) -> Optional[str]:
     return entry.get('ols', {}).get('version.iri')
 
 
+def is_provider(prefix: str) -> bool:
+    """Get if the prefix is a provider.
+
+    :param prefix: The prefix to look up
+    :returns: if the prefix is a provider
+
+    >>> assert not is_provider('pdb')
+    >>> assert is_provider('validatordb')
+    """
+    entry = get(prefix)
+    if entry is None:
+        return False
+    return entry.get('type') == 'provider'
+
+
+def get_provides_for(prefix: str) -> Optional[str]:
+    """Get the resource that the given prefix provides for, or return none if not a provider.
+
+    :param prefix: The prefix to look up
+    :returns: The prefix of the resource that the given prefix provides for, if it's a provider
+
+    >>> assert get_provides_for('pdb') is None
+    >>> assert 'pdb' == get_provides_for('validatordb')
+    """
+    entry = get(prefix)
+    if entry is None:
+        return None
+    return entry.get('provides')
+
+
 def parse_curie(curie: str) -> Union[Tuple[str, str], Tuple[None, None]]:
     """Parse a CURIE, normalizing the prefix and identifier if necessary.