You can now select group and system data in selectors

src/ifcopenshell-python/docs/ifcopenshell-python/selector_syntax.rst

@@ -183,8 +183,11 @@ Valid keys are:
     "``space``", "Gets the first IfcSpace spatial element that an element is contained in."
     "``storey``", "Gets the first IfcBuildingStorey spatial element that an element is contained in."
     "``building``", "Gets the first IfcBuilding spatial element that an element is contained in."
-    "``site``", "Gets the first IccSite spatial element that an element is contained in."
+    "``site``", "Gets the first IfcSite spatial element that an element is contained in."
     "``parent``", "Gets the parent element in the spatial hierarchy."
+    "``classification``", "Gets the element's classification reference(s)"
+    "``group``", "Gets the element's group(s)"
+    "``system``", "Gets the element's system(s). This is a subset of group(s)."
     "``material`` or ``mat``", "Gets the assigned material, which may be a material set."
     "``item`` or ``i``", "If the previous key returns a material set, gets the relevant material set items"
     "``materials`` or ``mats``", "Gets a list of IfcMaterials assigned directly or indirectly (such as via a material set) to the element"

src/ifcopenshell-python/ifcopenshell/util/selector.py

@@ -31,6 +31,7 @@ import ifcopenshell.util.geolocation
 import ifcopenshell.util.classification
 import ifcopenshell.util.schema
 import ifcopenshell.util.shape
+import ifcopenshell.util.system
 from decimal import Decimal
 from typing import Optional, Any, Union, Iterable
 
@@ -331,6 +332,10 @@ def _get_element_value(element: ifcopenshell.entity_instance, keys: list[str]) -
             value = value.id()
         elif key == "classification":
             value = ifcopenshell.util.classification.get_references(value)
+        elif key == "group":
+            value = ifcopenshell.util.element.get_groups(value)
+        elif key == "system":
+            value = ifcopenshell.util.system.get_element_systems(value)
         elif key in ("x", "y", "z", "easting", "northing", "elevation") and hasattr(value, "ObjectPlacement"):
             if getattr(value, "ObjectPlacement", None):
                 matrix = ifcopenshell.util.placement.get_local_placement(value.ObjectPlacement)