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-rw-r--r--src/lxml/isoschematron/resources/rng/iso-schematron.rng5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/lxml/isoschematron/resources/rng/iso-schematron.rng b/src/lxml/isoschematron/resources/rng/iso-schematron.rng
index dcb08038..a4f504af 100644
--- a/src/lxml/isoschematron/resources/rng/iso-schematron.rng
+++ b/src/lxml/isoschematron/resources/rng/iso-schematron.rng
@@ -83,7 +83,10 @@
<optional>
<ref name="diagnostics"/>
</optional>
- <ref name="properties"/>
+ <optional>
+ <!-- edited (lxml): required in standard, optional here (since it can be empty anyway) -->
+ <ref name="properties"/>
+ </optional>
</group>
</interleave>
</element>