<xsd:simpleType name="ST_CalloutPlacement">
    <xsd:annotation>
        <xsd:documentation>Callout Placement</xsd:documentation>
    </xsd:annotation>
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="top">
            <xsd:annotation>
                <xsd:documentation>Top placement</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
        <xsd:enumeration value="center">
            <xsd:annotation>
                <xsd:documentation>Center placement</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
        <xsd:enumeration value="bottom">
            <xsd:annotation>
                <xsd:documentation>Bottom placement</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
        <xsd:enumeration value="user">
            <xsd:annotation>
                <xsd:documentation>User-defined placement</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
    </xsd:restriction>
</xsd:simpleType>