test: test for bad dates

src/ome_types/_conversion.py

@@ -52,7 +52,7 @@ class ParserKwargs(TypedDict, total=False):
 
 def _get_ome_type(xml: str | bytes) -> type[OMEType]:
     """Resolve a python model class for the root element of an OME XML document."""
-    if isinstance(xml, str) and not xml.startswith("<"):
+    if isinstance(xml, str) and not xml.lstrip().startswith("<"):
         root = ET.parse(xml).getroot()  # noqa: S314
     else:
         if not isinstance(xml, bytes):

tests/test_model.py

@@ -172,3 +172,21 @@ def test_xml_annotation() -> None:
     assert isinstance(xml_ann.value.any_elements[0], AnyElement)
 
     assert raw_xml in to_xml(xml_ann, indent=0)
+
+
+def test_bad_date() -> None:
+    """Test that dates with too many microseconds are handled gracefully."""
+
+    XML = """
+    <OME xmlns="http://www.openmicroscopy.org/Schemas/OME/2016-06">
+    <Image ID="Image:0">
+        <AcquisitionDate>2020-09-08T17:26:16.769000000</AcquisitionDate>
+        <Pixels DimensionOrder="XYCTZ" Type="uint8" SizeC="1" SizeT="1"
+                SizeX="18" SizeY="24" SizeZ="5">
+        </Pixels>
+    </Image>
+    </OME>
+    """
+
+    obj = from_xml(XML)
+    assert obj.images[0].acquisition_date.microsecond == 769000  # type: ignore