diff --git a/src/ifctester/ifctester/__init__.py b/src/ifctester/ifctester/__init__.py
index 46b38aa82e..f7d708105d 100644
--- a/src/ifctester/ifctester/__init__.py
+++ b/src/ifctester/ifctester/__init__.py
@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcTester.  If not, see <http://www.gnu.org/licenses/>.
 
-from .ids import open as open
+from .ids import open
 
 __version__ = version = "0.0.0"
+__all__ = ["open"]
diff --git a/src/ifctester/ifctester/ids.py b/src/ifctester/ifctester/ids.py
index d6ae3bd44a..8d00ce9fac 100644
--- a/src/ifctester/ifctester/ids.py
+++ b/src/ifctester/ifctester/ids.py
@@ -28,14 +28,21 @@ from xmlschema import XMLSchema, etree_tostring
 from xmlschema.validators.exceptions import XMLSchemaValidationError
 
 from .facet import (
+    Attribute,
     Cardinality,
+    Classification,
     Entity,
     Facet,
     FacetFailure,
+    Material,
+    PartOf,
+    Property,
+    Restriction,
     get_pset,
     get_psets,
 )
 
+__all__ = ["Attribute", "Classification", "Entity", "Material", "PartOf", "Property", "Restriction"]
 cwd = os.path.dirname(os.path.realpath(__file__))
 schema = None