<xs:element name="event">
    <xs:annotation>
        <xs:documentation>Structured information about an event without a concept identifier</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:sequence>
            <xs:element ref="name" maxOccurs="unbounded" />
            <xs:choice minOccurs="0" maxOccurs="unbounded">
                <xs:element ref="definition" />
                <xs:element ref="note" />
                <xs:element ref="facet" />
            </xs:choice>
            <xs:group ref="ConceptRelationshipsGroup" />
            <xs:element ref="eventDetails" />
        </xs:sequence>
    </xs:complexType>
</xs:element>