Allow iteration over IDSMetadata children

Author: maarten-ic

imaspy/ids_metadata.py

@@ -7,7 +7,7 @@
 from enum import Enum
 from functools import lru_cache
 from pathlib import Path
-from typing import Any, Dict, Optional, Tuple, Type
+from typing import Any, Dict, Iterator, Optional, Tuple, Type
 from xml.etree.ElementTree import Element
 
 from imaspy.ids_coordinates import IDSCoordinate
@@ -271,6 +271,9 @@ def __copy__(self):
     def __deepcopy__(self, memo: dict):
         return self  # IDSMetadata is immutable
 
+    def __iter__(self) -> Iterator["IDSMetadata"]:
+        return iter(self._children.values())
+
     def __getitem__(self, path):
         item = self
         for part in re.split("[./]", path):