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-rw-r--r--morphlib/morphloader.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/morphlib/morphloader.py b/morphlib/morphloader.py
index bc7ab6ef..eeefbe65 100644
--- a/morphlib/morphloader.py
+++ b/morphlib/morphloader.py
@@ -661,7 +661,7 @@ class MorphologyLoader(object):
def _deny_unknown_fields(self, allowed, morphology):
for field in morphology:
- if field not in allowed:
+ if field not in allowed and not field.startswith('x-'):
raise InvalidFieldError(field, morphology.filename)
def set_defaults(self, morphology):