diff --git a/src/urdf_parser_py/urdf.py b/src/urdf_parser_py/urdf.py
index 0cc3090..789f39f 100644
--- a/src/urdf_parser_py/urdf.py
+++ b/src/urdf_parser_py/urdf.py
@@ -352,18 +352,19 @@ def joint_type(self, value): self.type = value
 class Link(xmlr.Object):
     def __init__(self, name=None, visual=None, inertial=None, collision=None,
                  origin=None):
+        self.aggregate_init()
         self.name = name
-        self.visual = visual
-        self.inertial = inertial
-        self.collision = collision
+        self.visuals = []
+        self.inertials = inertial
+        self.collisions = []
         self.origin = origin
 
 xmlr.reflect(Link, params=[
     name_attribute,
     origin_element,
+    xmlr.AggregateElement('visual', Visual),
+    xmlr.AggregateElement('collision', Collision),
     xmlr.Element('inertial', Inertial, False),
-    xmlr.Element('visual', Visual, False),
-    xmlr.Element('collision', Collision, False)
 ])