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<?xml version="1.0" encoding="UTF-8"?>

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

  <xs:element name="observables">

    <xs:complexType>

      <xs:sequence>

        <xs:element name="schema" type="schemaType">

        </xs:element>

        <xs:element name="obsId" minOccurs="0" type="xs:string">

        </xs:element>

        <xs:element name="origin" type="originType">

        </xs:element>

        <xs:choice>

          <xs:element name="dobs" maxOccurs="unbounded" type="dobsType">

          </xs:element>

          <xs:element name="cobs" maxOccurs="unbounded" type="cobsType">

          </xs:element>

          <xs:element name="pobs" maxOccurs="unbounded" type="pobsType">

          </xs:element>

        </xs:choice>

      </xs:sequence>

    </xs:complexType>

  </xs:element>

  <xs:complexType name="schemaType">

    <xs:sequence>

      <xs:element name="name" type="xs:string">

      </xs:element>

      <xs:element name="version" type="xs:string">

      </xs:element>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="originType">

    <xs:sequence>

      <xs:element name="who" type="xs:string">

      </xs:element>

      <xs:element name="date" type="xs:string">

      </xs:element>

      <xs:element name="host" type="xs:string">

      </xs:element>

      <xs:element name="tool">

        <xs:complexType>

          <xs:sequence>

            <xs:element name="name" type="xs:string">

            </xs:element>

            <xs:element name="version" type="xs:string">

            </xs:element>

          </xs:sequence>

        </xs:complexType>

      </xs:element>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="freeTree" mixed="true">

    <xs:sequence>

      <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax">

      </xs:any>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="arrayType" mixed="true">

    <xs:sequence>

      <xs:element name="id" type="xs:string">

      </xs:element>

      <xs:element name="symbol" minOccurs="0" type="xs:string">

      </xs:element>

      <xs:element name="layout" type="xs:string">

      </xs:element>

    </xs:sequence>

  </xs:complexType>

  <xs:group name="edataGroup">

    <xs:sequence>

      <xs:element name="enstag" type="xs:string">

      </xs:element>

      <xs:element name="nr" type="xs:int">

      </xs:element>

      <xs:sequence maxOccurs="unbounded">

        <xs:element name="origin" minOccurs="0" type="freeTree">

        </xs:element>

        <xs:element name="array" type="arrayType">

        </xs:element>

      </xs:sequence>

    </xs:sequence>

  </xs:group>

  <xs:complexType name="pobsType">

    <xs:sequence>

      <xs:element name="spec" minOccurs="0" type="freeTree">

      </xs:element>

      <xs:element name="origin" minOccurs="0" type="freeTree">

      </xs:element>

      <xs:element name="name" type="xs:string">

      </xs:element>

      <xs:group ref="edataGroup">

      </xs:group>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="dobsType">

    <xs:sequence>

      <xs:element name="spec" type="freeTree">

      </xs:element>

      <xs:element name="origin" minOccurs="0" type="freeTree">

      </xs:element>

      <xs:element name="name" type="xs:string">

      </xs:element>

      <xs:element name="array" type="arrayType">

      </xs:element>

      <xs:element name="ne" type="xs:int">

      </xs:element>

      <xs:element name="nc" type="xs:int">

      </xs:element>

      <xs:element name="edata" maxOccurs="unbounded">

        <xs:complexType>

          <xs:group ref="edataGroup">

          </xs:group>

        </xs:complexType>

      </xs:element>

      <xs:element name="cdata" minOccurs="0" maxOccurs="unbounded" type="cobsType">

      </xs:element>

    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="cobsType">

    <xs:sequence>

      <xs:element name="id" type="xs:string">

      </xs:element>

      <xs:element name="array" type="arrayType">

      </xs:element>

      <xs:element name="array" type="arrayType">

      </xs:element>

    </xs:sequence>

  </xs:complexType>

  <xs:element name="OBSERVABLES">

    <xs:complexType>

      <xs:sequence>

        <xs:element name="SCHEMA" type="SCHEMATYPE">

        </xs:element>

        <xs:element name="origin" type="originType">

        </xs:element>

        <xs:choice>

          <xs:element name="dobs" maxOccurs="unbounded" type="dobsType">

          </xs:element>

          <xs:element name="cobs" maxOccurs="unbounded" type="cobsType">

          </xs:element>

          <xs:element name="pobs" maxOccurs="unbounded" type="pobsType">

          </xs:element>

        </xs:choice>

      </xs:sequence>

    </xs:complexType>

  </xs:element>

  <xs:complexType name="SCHEMATYPE">

    <xs:sequence>

      <xs:element name="NAME" type="xs:string">

      </xs:element>

      <xs:element name="VERSION" type="xs:string">

      </xs:element>

    </xs:sequence>

  </xs:complexType>

</xs:schema>