<xs:element name="alias" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.2.5 equivalent name ( to typeName) by which the featureType is known </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="catalogueName" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.1.1 The common name for the feature catalogue</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="catalogueScope" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.1.2 Subject domain(s) of the feeature types contained in this feature catalogue</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="code" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.2.3 This is included to store the code value of the alphanumeric code = e.g. M_iM_iM_jM_j in WMO vol 306. 
			Here we usurp the definition of "code" within 19110 and use the xml attribute "id" to refer uniquely to the feature within the catalogue</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="definition" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.2.2 definition of the feature type (extended also to feature attribute) in natural language or alternatively a reference or citation where this may be found. </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="featureAttribute" type="FC_FeatureAttributeType">
  <xs:annotation>
    <xs:documentation>B.8 Characteristic of a feature type.
			Here we mean a data elenent which, if it exists, is contained within the featureType file, dataset or container</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="featureCatalogue" type="FC_FeatureCatalogueType">
  <xs:annotation>
    <xs:documentation>B.1 A feature catalogue contains its identifcation and contact information, 
			and definition of some number of feature types with other information necessary for those definitions</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="featureType" type="FC_FeatureTypeType">
  <xs:annotation>
    <xs:documentation>B.2 Class or real world phenomena with common properties.
			In this version it should be read as a dataset type with common file contents</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="featureTypeList" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.1.8 list of feature types </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="fieldOfApplication" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.1.3 Description of kind(s) of use to which this feeature catalogue may be put </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="functionalLanguage" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.1.7 the formal functional language in which the feature operation formal definition occurs in this feature catalogue.
			As this feature catalogue is posited to be a dataset description form, with no application functinonality, this is not relevant </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="memberName" type="memberNameType">
  <xs:annotation>
    <xs:documentation>>B.8 This is the de-facto specification of featureAttribute </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="producer" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.1.6 Name, address, country and email address of person or organisation having primary responsibility for the intellectual content of this feature catalogue </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="typeName" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.2.1 text string which uniquely identifies this feature type within the feature catalogue that contains the feature type </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="versionDate" type="xs:dateTime">
  <xs:annotation>
    <xs:documentation>B.1.5 effective date of this feature catalogue </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="versionNumber" type="xs:string">
  <xs:annotation>
    <xs:documentation>B.1.4 version number of this feature catalogue which may include major and minor versions </xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="FC_FeatureAttributeType">
  <xs:annotation>
    <xs:documentation>B.8 Characteristic of a feature type.
			Here we mean a data elenent which, if it exists, is contained within the featureType file, dataset or container</xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:sequence>
      <xs:element ref="memberName"/>
      <xs:element ref="definition" minOccurs="0"/>
    </xs:sequence>
    <xs:element name="memberReference" type="memberReferenceType">
      <xs:annotation>
        <xs:documentation>a reference to another feature attribute which should be regareded as a copy or an alias</xs:documentation>
      </xs:annotation>
    </xs:element>
  </xs:choice>
</xs:complexType>

<xs:element name="memberReference" type="memberReferenceType">
  <xs:annotation>
    <xs:documentation>a reference to another feature attribute which should be regareded as a copy or an alias</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="FC_FeatureCatalogueType">
  <xs:annotation>
    <xs:documentation>B.1 A feature catalogue contains its identifcation and contact information, 
			and definition of some number of feature types with other information necessary for those definitions</xs:documentation>
  </xs:annotation>
  <xs:sequence>
    <xs:element ref="catalogueName"/>
    <xs:element ref="catalogueScope"/>
    <xs:element ref="fieldOfApplication"/>
    <xs:element ref="versionNumber"/>
    <xs:element ref="versionDate"/>
    <xs:element ref="producer"/>
    <xs:element ref="functionalLanguage" minOccurs="0"/>
    <xs:element ref="featureType" maxOccurs="unbounded"/>
  </xs:sequence>
</xs:complexType>

<xs:complexType name="FC_FeatureTypeType">
  <xs:annotation>
    <xs:documentation>B.2 Class or real world phenomena with common properties.
			In this version it should be read as a dataset type with common file contents</xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:sequence>
      <xs:element ref="typeName"/>
      <xs:element ref="alias" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element ref="definition"/>
      <xs:element ref="code"/>
      <xs:element ref="featureAttribute" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:element name="featureTypeReference" type="memberReferenceType">
      <xs:annotation>
        <xs:documentation>a reference to another featureType within the same catalogue.
					This is a shortcut to the 19110 aggregation model</xs:documentation>
      </xs:annotation>
    </xs:element>
  </xs:choice>
  <xs:attribute name="id" type="xs:ID"/>
</xs:complexType>

<xs:element name="featureTypeReference" type="memberReferenceType">
  <xs:annotation>
    <xs:documentation>a reference to another featureType within the same catalogue.
					This is a shortcut to the 19110 aggregation model</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="memberNameType">
  <xs:annotation>
    <xs:documentation>B.8 This is the de-facto specification of featureAttribute. It uses attributes instead of elements for the identification and specification of the featureAttribute </xs:documentation>
    <xs:documentation>
 			id is the unique reference within the catalogue (originally code B.8.1)
 			units is otherwise B.8.2 valueMeasurementUnits and can be a list of allowable units
 			type is the variable type in the XMLSchema namespace. Note that many WMO 306 Alphanumeric elements are code values or integers embedded within a string, and therefore can't be properly trepresented by NMTOKEN.
                    codeName is an extension of B.8.3 listedValue to refer to code tables such as WMO 306 or BUFR code tables</xs:documentation>
  </xs:annotation>
  <xs:simpleContent>
    <xs:extension base="xs:string">
      <xs:attribute name="id" type="xs:ID"/>
      <xs:attribute name="units" type="xs:string" default="none"/>
      <xs:attribute name="type" type="xs:NMTOKEN" default="xs:string"/>
      <xs:attribute name="codeName" type="xs:string" default="none"/>
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>

<xs:complexType name="memberReferenceType">
  <xs:annotation>
    <xs:documentation>a reference to another feature attribute which should be regareded as a copy or an alias</xs:documentation>
  </xs:annotation>
  <xs:simpleContent>
    <xs:extension base="xs:string">
      <xs:attribute name="referenceID" type="xs:IDREF"/>
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>