code: def postprocess_model_xml(xml_str):
      
  
      path = os.path.split(robosuite.__file__)[0]
      path_split = path.split("/")
  
      # replace mesh and texture file paths
      tree = ET.fromstring(xml_str)
      root = tree
      asset = root.find("asset")
      meshes = asset.findall("mesh")
      textures = asset.findall("texture")
      all_elements = meshes + textures
  
      for elem in all_elements:
          old_path = elem.get("file")
          if old_path is None:
              continue
          old_path_split = old_path.split("/")
          ind = max(
              loc for loc, val in enumerate(old_path_split) if val == "robosuite"
          )  # last occurrence index
          new_path_split = path_split + old_path_split[ind + 1 :]
          new_path = "/".join(new_path_split)
          elem.set("file", new_path)
  
      return ET.tostring(root, encoding="utf8").decode("utf8")
docs: This function postprocesses the model.xml collected from a MuJoCo demonstration
      in order to make sure that the STL files can be found.