<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
  <xs:group name="DataConnectionCustomization-G">
    <xs:sequence>
      <xs:element minOccurs="0" name="connection-customization">
        <xs:complexType>
          <xs:sequence>
            <xs:group ref="Vendor-G"/>
            <xs:group ref="Driver-G"/>
            <xs:group ref="Customizations-G"/>
          </xs:sequence>
          <xs:attribute name="version" type="VersionNumber-ST" use="required"/>
          <xs:attribute name="class" type="xs:string" use="required"/>
          <xs:attribute name="enabled" type="xs:boolean" use="required"/>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:group name="Vendor-G">
    <xs:sequence>
      <xs:element name="vendor">
        <xs:complexType>
          <xs:attribute name="name" type="xs:string"/>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:group name="Driver-G">
    <xs:sequence>
      <xs:element name="driver">
        <xs:complexType>
          <xs:attribute name="name" type="xs:string"/>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:group name="Customizations-G">
    <xs:sequence>
      <xs:element name="customizations">
        <xs:complexType>
          <xs:sequence>
            <xs:group ref="DataConnectionCust-Customizations-G"/>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:group name="DataConnectionCust-Customizations-G">
    <xs:sequence>
      <xs:group minOccurs="0" maxOccurs="unbounded" ref="DataConnectionCust-Customization-G"/>
    </xs:sequence>
  </xs:group>
  <xs:group name="DataConnectionCust-Customization-G">
    <xs:sequence>
      <xs:element name="customization">
        <xs:complexType>
          <xs:attribute name="name" type="xs:string"/>
          <xs:attribute name="value" type="xs:string"/>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:simpleType name="OSShortName-ST">
    <xs:restriction base="xs:string">
      <xs:enumeration value="win"/>
      <xs:enumeration value="mac"/>
      <xs:enumeration value="linux"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name="ScriptElement-CT">
    <xs:simpleContent>
      <xs:annotation>
        <xs:documentation>Either an embedded script or the name of a file in the local directory.</xs:documentation>
      </xs:annotation>
      <xs:extension base="xs:string">
        <xs:attribute name="file"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:simpleType name="Double-ST">
    <xs:union memberTypes="xs:double XML-RealSpecial-ST"/>
  </xs:simpleType>
  <xs:simpleType name="Float-ST">
    <xs:union memberTypes="xs:float XML-RealSpecial-ST"/>
  </xs:simpleType>
  <xs:simpleType name="XML-RealSpecial-ST">
    <xs:restriction base="xs:string">
      <xs:enumeration value="nan"/>
      <xs:enumeration value="inf"/>
      <xs:enumeration value="-inf"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="VersionNumber-ST">
    <xs:restriction base="xs:string">
      <xs:pattern value="(\d+)((\.)(\d+))*((-)(\d+))*"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:group name="VendorInformation-G">
    <xs:sequence>
      <xs:element name="vendor-information">
        <xs:complexType>
          <xs:sequence>
            <xs:group ref="Company-G"/>
            <xs:group ref="SupportLink-G"/>
            <xs:group ref="DriverDownloadLink-G" minOccurs="0"/>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:group name="Company-G">
    <xs:sequence>
      <xs:element name="company">
        <xs:complexType>
          <xs:attribute name="name" type="NonEmptyString-ST" use="required"/>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:group name="SupportLink-G">
    <xs:sequence>
      <xs:element name="support-link">
        <xs:complexType>
          <xs:attribute name="url" type="xs:anyURI" use="required"/>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:group name="DriverDownloadLink-G">
    <xs:sequence>
      <xs:element name="driver-download-link">
        <xs:complexType>
          <xs:attribute name="url" type="xs:anyURI" use="required"/>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:group>
  <xs:element name="connector-plugin">
    <xs:complexType>
      <xs:sequence>
        <xs:group ref="VendorInformation-G"/>
        <xs:element minOccurs="0" name="platforms" type="Platforms-CT"/>
        <xs:group ref="DataConnectionCustomization-G"/>
        <xs:choice>
          <xs:element minOccurs="0" name="connection-fields" type="ScriptElement-CT"/>
          <xs:element minOccurs="0" name="connection-dialog" type="ScriptElement-CT"/>
        </xs:choice>
        <xs:element minOccurs="0" name="connection-metadata" type="ScriptElement-CT"/>
        <xs:element minOccurs="0" name="connection-resolver" type="ScriptElement-CT"/>
        <xs:element minOccurs="0" name="dialect" type="ScriptElement-CT"/>
        <xs:element minOccurs="0" name="oauth-config" type="ScriptElement-CT"/>
        <xs:element minOccurs="0" maxOccurs="unbounded" name="license-key" type="LicenseKey-ST"/>
      </xs:sequence>

      <xs:attribute name="class" type="xs:token" use="required"/>
      <xs:attribute name="name" type="xs:string" use="required"/>
      <xs:attribute name="plugin-version" type="VersionNumber-ST" use="required"/>
      <xs:attribute name="superclass" type="xs:token" use="required"/>
      <xs:attribute name="version" type="VersionNumber-ST" use="required"/>
      <xs:attribute name="min-version-tableau" type="VersionNumber-ST" use="optional"/>
    </xs:complexType>
  </xs:element>
  <xs:simpleType name="LicenseKey-ST">
    <xs:restriction base="xs:token">
      <xs:pattern value="[A-Z][A-Z0-9]*"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name="Platforms-CT">
    <xs:choice maxOccurs="unbounded">
      <xs:element name="platform" type="Platform-ST"/>
    </xs:choice>
  </xs:complexType>
  <xs:complexType name="Platform-ST">
    <xs:attribute name="name" type="OSShortName-ST" use="required"/>
  </xs:complexType>
  <xs:simpleType name="NonEmptyString-ST">
    <xs:restriction base="xs:string">
      <xs:minLength value="1"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>