4 files changed, 13 insertions, 4 deletions
diff --git a/bsie/extractor/base.py b/bsie/extractor/base.py
index 95689a5..8ab1124 100644
--- a/bsie/extractor/base.py
+++ b/bsie/extractor/base.py
@@ -31,13 +31,22 @@ SCHEMA_PREAMBLE = '''
     prefix bsfs: <http://bsfs.ai/schema/>
     prefix bse: <http://bsfs.ai/schema/Entity#>
 
+    # default definitions
+    bsfs:Array rdfs:subClassOf bsfs:Literal .
+    bsfs:Number rdfs:subClassOf bsfs:Literal .
+    bsfs:Time rdfs:subClassOf bsfs:Literal .
+    bsfs:Feature rdfs:subClassOf bsfs:Array ;
+        bsfs:dimension "1"^^xsd:integer ;
+        bsfs:dtype bsfs:f16 ;
+        bsfs:distance bsfs:euclidean .
+
     # essential nodes
     bsfs:Entity rdfs:subClassOf bsfs:Node .
     bsfs:File rdfs:subClassOf bsfs:Entity .
 
     # common definitions
     xsd:string rdfs:subClassOf bsfs:Literal .
-    xsd:integer rdfs:subClassOf bsfs:Literal .
+    xsd:integer rdfs:subClassOf bsfs:Number .
 
     '''
 
diff --git a/bsie/extractor/generic/constant.py b/bsie/extractor/generic/constant.py
index 7b1d942..938e20c 100644
--- a/bsie/extractor/generic/constant.py
+++ b/bsie/extractor/generic/constant.py
@@ -34,7 +34,7 @@ class Constant(base.Extractor):
             schema: str,
             tuples: typing.Iterable[typing.Tuple[bsfs.URI, typing.Any]],
             ):
-        super().__init__(bsfs.schema.Schema.from_string(base.SCHEMA_PREAMBLE + schema))
+        super().__init__(bsfs.schema.from_string(base.SCHEMA_PREAMBLE + schema))
         # NOTE: Raises a KeyError if the predicate is not part of the schema
         self._tuples = tuple((self.schema.predicate(p_uri), value) for p_uri, value in tuples)
         # TODO: use schema instance for value checking
diff --git a/bsie/extractor/generic/path.py b/bsie/extractor/generic/path.py
index 295715f..c984515 100644
--- a/bsie/extractor/generic/path.py
+++ b/bsie/extractor/generic/path.py
@@ -29,7 +29,7 @@ class Path(base.Extractor):
     _callmap: typing.Dict[bsfs.schema.Predicate, typing.Callable[[str], typing.Any]]
 
     def __init__(self):
-        super().__init__(bsfs.schema.Schema.from_string(base.SCHEMA_PREAMBLE + '''
+        super().__init__(bsfs.schema.from_string(base.SCHEMA_PREAMBLE + '''
             bse:filename rdfs:subClassOf bsfs:Predicate ;
                 rdfs:domain bsfs:File ;
                 rdfs:range xsd:string ;
diff --git a/bsie/extractor/generic/stat.py b/bsie/extractor/generic/stat.py
index 1381fe2..9394456 100644
--- a/bsie/extractor/generic/stat.py
+++ b/bsie/extractor/generic/stat.py
@@ -31,7 +31,7 @@ class Stat(base.Extractor):
     _callmap: typing.Dict[bsfs.schema.Predicate, typing.Callable[[os.stat_result], typing.Any]]
 
     def __init__(self):
-        super().__init__(bsfs.schema.Schema.from_string(base.SCHEMA_PREAMBLE + '''
+        super().__init__(bsfs.schema.from_string(base.SCHEMA_PREAMBLE + '''
             bse:filesize rdfs:subClassOf bsfs:Predicate ;
                 rdfs:domain bsfs:File ;
                 rdfs:range xsd:integer ;