<element name="extension" type="anyType" minOccurs="0" maxOccurs="unbounded">
  <annotation>
    <documentation>Extension slot for future extensions to this standard.</documentation>
  </annotation>
</element>

<element name="identifier" type="anyURI" minOccurs="0">
  <annotation>
    <documentation>Unique identifier of the data component. It can be used to globally identify a particular component of the dataset, a process input/output or a universal constant</documentation>
  </annotation>
</element>

<element name="label" type="string" minOccurs="0">
  <annotation>
    <documentation>Textual label for the data component . This is often used for displaying a human readable name for a dataset field or a process input/output</documentation>
  </annotation>
</element>

<element name="description" type="string" minOccurs="0">
  <annotation>
    <documentation>Textual description (i.e. human readable) of the data component usually used to clarify its nature</documentation>
  </annotation>
</element>

<swe:AbstractSWE id="" xmlns:swe="http://www.opengis.net/swe/2.0">
  <swe:extension>{0,unbounded}</swe:extension>
</swe:AbstractSWE>

<element name="AbstractSWE" type="swe:AbstractSWEType" abstract="true">
  <annotation>
    <documentation>Base substitution groups for all SWE Common objects other than value objects</documentation>
  </annotation>
</element>

<swe:AbstractSWEIdentifiable id="" xmlns:swe="http://www.opengis.net/swe/2.0">
  <swe:extension>{0,unbounded}</swe:extension>
  <swe:identifier>{0,1}</swe:identifier>
  <swe:label>{0,1}</swe:label>
  <swe:description>{0,1}</swe:description>
</swe:AbstractSWEIdentifiable>

<element name="AbstractSWEIdentifiable" type="swe:AbstractSWEIdentifiableType" abstract="true" substitutionGroup="swe:AbstractSWE">
  <annotation>
    <documentation>Base substitution groups for all SWE Common objects with identification metadata</documentation>
  </annotation>
</element>

<complexType name="AbstractSWEIdentifiableType">
  <complexContent>
    <extension base="swe:AbstractSWEType">
      <sequence>
        <element name="identifier" type="anyURI" minOccurs="0">
          <annotation>
            <documentation>Unique identifier of the data component. It can be used to globally identify a particular component of the dataset, a process input/output or a universal constant</documentation>
          </annotation>
        </element>
        <element name="label" type="string" minOccurs="0">
          <annotation>
            <documentation>Textual label for the data component . This is often used for displaying a human readable name for a dataset field or a process input/output</documentation>
          </annotation>
        </element>
        <element name="description" type="string" minOccurs="0">
          <annotation>
            <documentation>Textual description (i.e. human readable) of the data component usually used to clarify its nature</documentation>
          </annotation>
        </element>
      </sequence>
    </extension>
  </complexContent>
</complexType>

<complexType name="AbstractSWEType">
  <sequence>
    <element name="extension" type="anyType" minOccurs="0" maxOccurs="unbounded">
      <annotation>
        <documentation>Extension slot for future extensions to this standard.</documentation>
      </annotation>
    </element>
  </sequence>
  <attribute name="id" type="ID" use="optional"/>
</complexType>

<complexType name="NilValue">
  <simpleContent>
    <extension base="token">
      <attribute name="reason" type="anyURI" use="required"/>
    </extension>
  </simpleContent>
</complexType>

<complexType name="UnitReference">
  <attribute name="code" type="swe:UomSymbol" use="optional"/>
  <attributeGroup ref="swe:AssociationAttributeGroup"/>
</complexType>

<simpleType name="UomSymbol">
  <annotation>
    <documentation>This type specifies a character string of length at least one, and restricted such that it must not contain any of the following characters: ":" (colon), " " (space), (newline), (carriage return), (tab). This allows values corresponding to familiar abbreviations, such as "kg", "m/s", etc. It is also required that the symbol be an identifier for a unit of measure as specified in the "Unified Code of Units of Measure" (UCUM) (http://aurora.regenstrief.org/UCUM). This provides a set of symbols and a grammar for constructing identifiers for units of measure that are unique, and may be easily entered with a keyboard supporting the limited character set known as 7-bit ASCII. ISO 2955 formerly provided a specification with this scope, but was withdrawn in 2001. UCUM largely follows ISO 2955 with modifications to remove ambiguities and other problems.</documentation>
  </annotation>
  <restriction base="string">
    <pattern value="[^: \n\r\t]+"/>
  </restriction>
</simpleType>

<simpleType name="RealPair">
  <restriction>
    <simpleType>
      <list itemType="double"/>
    </simpleType>
    <length value="2"/>
  </restriction>
</simpleType>

<complexType name="Reference">
  <attributeGroup ref="swe:AssociationAttributeGroup"/>
</complexType>

<simpleType name="TimePosition">
  <union memberTypes="double swe:TimeIso8601"/>
</simpleType>

<simpleType name="TimePair">
  <restriction>
    <simpleType>
      <list itemType="swe:TimePosition"/>
    </simpleType>
    <length value="2"/>
  </restriction>
</simpleType>

<simpleType name="TokenPair">
  <restriction>
    <simpleType>
      <list itemType="string"/>
    </simpleType>
    <length value="2"/>
  </restriction>
</simpleType>

<simpleType name="IntegerPair">
  <restriction>
    <simpleType>
      <list itemType="integer"/>
    </simpleType>
    <length value="2"/>
  </restriction>
</simpleType>

<complexType name="EncodedValuesPropertyType">
  <complexContent>
    <extension base="anyType">
      <attributeGroup ref="swe:AssociationAttributeGroup"/>
    </extension>
  </complexContent>
</complexType>

<simpleType name="TimeIso8601">
  <union memberTypes="date time dateTime swe:TimeIndeterminateValue"/>
</simpleType>

<simpleType name="TimeIndeterminateValue">
  <annotation>
    <documentation>"now" indicates that the specified value shall be replaced with the current temporal position whenever the value is accessed.</documentation>
  </annotation>
  <restriction base="string">
    <enumeration value="now"/>
  </restriction>
</simpleType>

<attribute name="id" type="ID" use="optional"/>

<attribute name="reason" type="anyURI" use="required"/>

<attribute name="code" type="swe:UomSymbol" use="optional"/>

<attributeGroup name="AssociationAttributeGroup">
  <attributeGroup ref="xlink:simpleAttrs"/>
</attributeGroup>