Update api.py

src/curies/api.py

@@ -958,8 +958,7 @@ def format_curie(self, prefix: str, identifier: str) -> str:
 
     def is_uri(self, uri: str) -> bool:
         """Check if a string is a valid URI based on the records in this converter."""
-        prefix, _ = self.parse_uri(uri)
-        return prefix is not None
+        return self.compress(uri) is not None
 
     def compress_strict(self, uri: str) -> str:
         """Compress a URI to a CURIE, and raise an error of not possible."""
@@ -1047,7 +1046,7 @@ def parse_uri(self, uri: str) -> Union[ReferenceTuple, Tuple[None, None]]:
 
     def is_curie(self, curie: str) -> bool:
         """Check if the CURIE is parsable under this converter."""
-        return self.expand(curie) is None
+        return self.expand(curie) is not None
 
     def expand_strict(self, curie: str) -> str:
         """Expand a CURIE to a URI, and raise an error of not possible."""