create_conference.xsd

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

	<xs:include schemaLocation="error.xsd"/>

	<xs:simpleType name="Mode">
		<xs:restriction base="xs:string">
			<xs:enumeration value="public"/>
			<xs:enumeration value="private"/>
		</xs:restriction>
	</xs:simpleType>

    <xs:simpleType name="Format">
        <xs:restriction base="xs:string">
            <xs:enumeration value="classic"/>
            <xs:enumeration value="consultation"/>
        </xs:restriction>
    </xs:simpleType>

	<xs:complexType name="Participant">
		<xs:attribute name="number" use="optional"/> <!-- If number is specified conversation_id will be ignored -->
		<xs:attribute name="conversation_id" use="optional"/>
	</xs:complexType>

	<xs:complexType name="CreateConference">
		<xs:sequence>
			<xs:element name="participant" minOccurs="0" maxOccurs="unbounded" type="Participant"/>
		</xs:sequence>
		<xs:attribute name="conference_id" type="xs:string" use="required"/>
		<xs:attribute name="description" type="xs:string" use="optional"/>
		<xs:attribute name="mode" type="Mode" use="optional"/>
        <xs:attribute name="format" type="Format" use="optional"/>
        <xs:attribute name="workitem_id" use="optional"/>
	</xs:complexType>

	<!-- in -->
	<xs:element name="in">
		<xs:complexType>
			<xs:all>
				<xs:element name="request">
					<xs:complexType>
						<xs:sequence>
							<xs:element name="create_conference" type="CreateConference"/>
						</xs:sequence>
					</xs:complexType>
				</xs:element>
			</xs:all>
		</xs:complexType>
	</xs:element>
	<!-- out -->
	<xs:element name="out">
		<xs:complexType>
			<xs:choice>
				<xs:element name="response">
					<xs:complexType>
						<xs:sequence>
							<xs:element name="ok"/>
						</xs:sequence>
					</xs:complexType>
				</xs:element>
				<xs:element name="error" type="errorType"/>
			</xs:choice>
		</xs:complexType>
	</xs:element>
</xs:schema>