diff --git a/schema/edxml.rng b/schema/edxml.rng
index d66f1840362eadcd5aaee0374b63ef85a9359eae..0aba2d9f3fc50201abd39eaaa01aea450a85f9f1 100644
--- a/schema/edxml.rng
+++ b/schema/edxml.rng
@@ -1767,6 +1767,12 @@
                 <ref name="attr.tei.degree"/>
             </optional>
             <oneOrMore>
+                <optional>
+                    <ref name="elem.part"/>
+                </optional>
+                <optional>
+                    <ref name="elem.seg"/>
+                </optional>
                 <optional>
                     <ref name="elem.g"/>
                 </optional>