diff --git a/src/geometry_api/geometry_api.py b/src/geometry_api/geometry_api.py
index 02dcd32..3de3d53 100644
--- a/src/geometry_api/geometry_api.py
+++ b/src/geometry_api/geometry_api.py
@@ -510,10 +510,12 @@ def _collect_attr(e, vals):
         expression = next(iter(au.owned_elements), None)
         if isinstance(expression, (syside.LiteralRational, syside.LiteralInteger)):
             vals[au.name] = float(expression.value)
+        elif expression is not None and isinstance(expression, syside.Expression):
+            compiler = syside.Compiler()
+            result, report = compiler.evaluate(expression)
+            vals[au.name] = float(result)
         elif isinstance(expression, syside.LiteralString):
             vals[au.name] = str(expression.value)
-
-
     
     def visit(el, parent_component=None, level=0):
             indent = "  " * level