</xs:attributeGroup>\r
<xs:attributeGroup name="EventAttributes">\r
<xs:attribute name="Usage" type="EventUsage" use="required"/>\r
- <xs:attribute name="EventGuidCName" type="C_NameType" use="required"/>\r
+ <xs:attribute name="EventGuidCName" type="C_NameType" use="optional"/>\r
<xs:attribute name="SupArchList" type="ArchListType" use="optional"/>\r
<xs:attribute name="FeatureFlag" type="FeatureFlagExpressionType" use="optional"/>\r
</xs:attributeGroup>\r