Add validation for number of datetimes in Temporal.interval

src/edr_pydantic/extent.py

@@ -1,7 +1,9 @@
+from typing import Annotated
 from typing import List
 from typing import Optional
 from typing import Union
 
+from annotated_types import Len
 from pydantic import AwareDatetime
 
 from .base_model import EdrBaseModel
@@ -13,8 +15,7 @@ class Spatial(EdrBaseModel):
 
 
 class Temporal(EdrBaseModel):
-    # TODO: Validate this list has two items (C.7.  Temporal Object)
-    interval: List[List[AwareDatetime]]
+    interval: List[Annotated[List[AwareDatetime], Len(min_length=2, max_length=2)]]
     # TODO: Validate this is a list of ISO 8601 single time, ISO 8601 time duration or ISO 8601 interval
     values: List[str]
     trs: str