<xsd:element name="UseSLDLibrary">
    <xsd:annotation>
        <xsd:documentation>
        The UseSLDLibrary tag specifies that an external SLD document
        should be used as a "library" of named layers and styles to
        augment the set of named layers and styles that are available
        for use inside of a WMS.  In the event of name collisions, the
        SLD library takes precedence over the ones internal to the WMS.
        Any number of libraries may be specified in an SLD and each
        successive library takes precedence over the former ones in the
        case of name collisions.
      </xsd:documentation>
    </xsd:annotation>
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element ref="sld:OnlineResource" />
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>