diff --git a/src/ifcopenshell-python/ifcopenshell/file.py b/src/ifcopenshell-python/ifcopenshell/file.py
index 20bbaf6165..35b977626d 100644
--- a/src/ifcopenshell-python/ifcopenshell/file.py
+++ b/src/ifcopenshell-python/ifcopenshell/file.py
@@ -662,7 +662,7 @@ class file_mixin:
         """General IFC schema version: IFC2X3, IFC4, IFC4X3."""
         prefixes = ("IFC", "X", "_ADD", "_TC")
         reg = "".join(f"(?P<{s}>{s}\\d+)?" for s in prefixes)
-        match = re.match(reg, self.schema)
+        match = re.match(reg, self.schema_identifier)
         version_tuple = tuple(
             map(
                 lambda pp: int(pp[1][len(pp[0]) :]) if pp[1] else None,
@@ -671,18 +671,13 @@ class file_mixin:
         )
         return "".join("".join(map(str, t)) if t[1] else "" for t in zip(prefixes, version_tuple[0:2]))
 
-    @property
-    def schema_identifier(self) -> str:
-        """Full IFC schema version: IFC2X3_TC1, IFC4_ADD2, IFC4X3_ADD2, etc."""
-        return self.schema
-
     @property
     def schema_version(self) -> tuple[int, int, int, int]:
         """Numeric representation of the full IFC schema version.
 
         E.g. IFC4X3_ADD2 is represented as (4, 3, 2, 0).
         """
-        schema = self.schema
+        schema = self.schema_identifier
         version = []
         for prefix in ("IFC", "X", "_ADD", "_TC"):
             number = re.search(prefix + r"(\d)", schema)
@@ -829,7 +824,7 @@ class file_mixin:
         """
         if self.transaction:
             self.transaction.store_delete(inst)
-        return self.remove(inst)
+        return self._remove(inst)
 
     def batch(self):
         """Low-level mechanism to speed up deletion of large subgraphs"""
diff --git a/src/ifcopenshell-python/test/test_file.py b/src/ifcopenshell-python/test/test_file.py
index 0c9bd4eda9..8238de339a 100644
--- a/src/ifcopenshell-python/test/test_file.py
+++ b/src/ifcopenshell-python/test/test_file.py
@@ -186,11 +186,13 @@ class TestFile(test.bootstrap.IFC4):
     def test_getting_an_element_by_id(self):
         element = self.file.createIfcWall("id")
         assert self.file.by_id(1) == element
-        assert self.file.by_id("id") == element
+        with pytest.raises(TypeError):
+            self.file.by_id("id")
 
     def test_getting_an_element_by_guid(self):
         element = self.file.createIfcWall("id")
-        assert self.file.by_guid(1) == element
+        with pytest.raises(TypeError):
+            self.file.by_guid(1)
         assert self.file.by_guid("id") == element
 
     def test_adding_an_element(self):
@@ -202,23 +204,23 @@ class TestFile(test.bootstrap.IFC4):
     def test_getting_elements_by_type(self):
         wall = self.file.createIfcWall()
         slab = self.file.createIfcSlab()
-        assert self.file.by_type("IfcWall") == [wall]
+        assert self.file.by_type("IfcWall") == (wall,)
 
     def test_getting_elements_by_exact_type(self):
         wall = self.file.createIfcWall()
-        assert self.file.by_type("IfcElement") == [wall]
+        assert self.file.by_type("IfcElement") == (wall,)
         assert len(self.file.by_type("IfcElement", include_subtypes=False)) == 0
 
     def test_traversing_direct_attributes_of_an_element(self):
         owner = self.file.createIfcOwnerHistory()
         element = self.file.createIfcWall(OwnerHistory=owner)
-        assert self.file.traverse(element) == [element, owner]
+        assert self.file.traverse(element) == (element, owner)
 
     def test_traversing_direct_attributes_of_an_element_to_a_limited_level(self):
         app = self.file.createIfcApplication()
         owner = self.file.createIfcOwnerHistory(OwningApplication=app)
         element = self.file.createIfcWall(OwnerHistory=owner)
-        assert self.file.traverse(element, max_levels=1) == [element, owner]
+        assert self.file.traverse(element, max_levels=1) == (element, owner)
 
     def test_getting_inverse_references_of_an_element(self):
         owner = self.file.createIfcOwnerHistory()
@@ -228,7 +230,7 @@ class TestFile(test.bootstrap.IFC4):
     def test_getting_multiple_inverses_if_an_element_is_referenced_twice_by_the_same_element(self):
         user = self.file.createIfcPersonAndOrganization()
         owner = self.file.createIfcOwnerHistory(OwningUser=user, LastModifyingUser=user)
-        assert self.file.get_inverse(user, allow_duplicate=True) == [owner, owner]
+        assert self.file.get_inverse(user, allow_duplicate=True) == (owner, owner)
 
     def test_removing_an_element(self):
         element = self.file.createIfcWall(GlobalId="global_id")
@@ -286,3 +288,9 @@ class TestFile(test.bootstrap.IFC4):
         g = ifcopenshell.file(schema="IFC4")
         g.assign_header_from(f)
         assert g.header.file_name.name == "test"
+
+def test_schema_identifier():
+    f = ifcopenshell.file(schema='IFC4X3')
+    assert f.schema_identifier == 'IFC4X3_ADD2'
+    assert f.schema == 'IFC4X3'
+    assert f.schema_version == (4,3,2,0)
diff --git a/src/ifcwrap/IfcParseWrapper.i b/src/ifcwrap/IfcParseWrapper.i
index c4514fb8b6..f440e64a29 100644
--- a/src/ifcwrap/IfcParseWrapper.i
+++ b/src/ifcwrap/IfcParseWrapper.i
@@ -78,7 +78,7 @@
 %rename("file") IfcFile;
 // _add() because mixin defined add which adds transaction logic
 %rename("_add") addEntity;
-%rename("remove") removeEntity;
+%rename("_remove") removeEntity;
 %rename("_traverse") traverse;
 %rename("_traverse_breadth_first") traverse_breadth_first;
 
@@ -274,7 +274,7 @@ private:
 	}
 	*/
 
-	std::string schema_name() const {
+	std::string schema_identifier() const {
 		if ($self->schema() == 0) return "";
 		return $self->schema()->name();
 	}
@@ -331,7 +331,7 @@ private:
 		def from_string(s: str) -> 'file':
 			return read(s)
 
-		schema = property(schema_name)
+		schema_identifier = property(schema_identifier)
 		header = property(header)
 		_registry = {}