<xs:simpleType name="ExistenceKind">
  <xs:annotation>
    <xs:documentation>A list of lifecycle states like actual, required, planned, predicted, etc. These are used to qualify any top-level element (from Epicentre 2.1).</xs:documentation>
  </xs:annotation>
  <xs:restriction base="eml:TypeEnum">
    <xs:enumeration value="actual">
      <xs:annotation>
        <xs:documentation>The object actually exists (from Epicentre 2.1).</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="planned">
      <xs:annotation>
        <xs:documentation>The object exists only in the planning stage (from Epicentre 2.1).</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="simulated">
      <xs:annotation>
        <xs:documentation>Created, artificially, as an artifact of processing, to replace or to stand for one or more similar objects. Often referred to as model (from Epicentre 2.1).</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
  </xs:restriction>
</xs:simpleType>