schema: add rule for sumof with nested expression

[free-sw/xcb/proto] / src / xcb.xsd

diff --git a/src/xcb.xsd b/src/xcb.xsd
index 85f5bc2..4ee578c 100644 (file)
--- a/src/xcb.xsd
+++ b/src/xcb.xsd
@@ -162,6 +162,9 @@ authorization from the authors.
       </xsd:element>
       <xsd:element name="sumof">
         <xsd:complexType>
+          <xsd:sequence>
+            <xsd:group ref="expression" minOccurs="0" maxOccurs="1"/>
+          </xsd:sequence>
           <xsd:attribute name="ref" use="required" type="xsd:string" />
         </xsd:complexType>
       </xsd:element>