<xs:element name="contentInfo" type="MD_ContentInformationType">
  <xs:annotation>
    <xs:documentation>16: information about the feature catalogue, coverage and image characteristics</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="dataQualityInfo" type="DQ_DataQualityType">
  <xs:annotation>
    <xs:documentation>18: information about the data quality</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="distributionInfo" type="MD_DistributionType">
  <xs:annotation>
    <xs:documentation>17: information about the distribution</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="hierarchyLevel" type="MD_ScopeCodeType">
  <xs:annotation>
    <xs:documentation>added in ET-IDM-4 to allow traversing a hierarchy of metadata</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="hierarchyLevelName" type="xs:string">
  <xs:annotation>
    <xs:documentation>added in ET-IDM-4 to allow traversing a hierarchy of metadata</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="identificationInfo" type="MD_DataIdentificationType">
  <xs:annotation>
    <xs:documentation>15: basic information about the data</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="metaData" type="MD_MetadataType"/>

<xs:element name="metadataCharacterSet" type="MD_CharacterSetCodeType">
  <xs:annotation>
    <xs:documentation>4: Character coding standard of metadata set</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="metadataContact" type="CI_ResponsiblePartyType">
  <xs:annotation>
    <xs:documentation>8: party responsible for the metadata</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="metadataDateStamp" type="xs:date">
  <xs:annotation>
    <xs:documentation>9: Metadata creation date</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="metadataFileIdentifier" type="xs:string">
  <xs:annotation>
    <xs:documentation>2: Metadata file identifier</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="metadataLanguage" type="xs:language" default="en">
  <xs:annotation>
    <xs:documentation>3: Language of metadata code</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="metadataStandardName" type="xs:string">
  <xs:annotation>
    <xs:documentation>10: name of metadata standard</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="metadataStandardVersion" type="xs:string">
  <xs:annotation>
    <xs:documentation>11: version of metadata standard</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="parentIdentifier" type="xs:string">
  <xs:annotation>
    <xs:documentation>added in ET-IDM-4 to allow traversing a hierarchy of metadata</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="referenceSystemInfo" type="MD_ReferenceSystemType">
  <xs:annotation>
    <xs:documentation>13: descriptions of the spatial and temporal reference systems used in the dataset</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="MD_MetadataType">
  <xs:annotation>
    <xs:documentation>Lines 2-22</xs:documentation>
  </xs:annotation>
  <xs:sequence>
    <xs:element ref="metadataFileIdentifier" minOccurs="0"/>
    <xs:element ref="metadataLanguage"/>
    <xs:element ref="metadataCharacterSet" minOccurs="0"/>
    <xs:element ref="metadataContact" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element ref="metadataDateStamp"/>
    <xs:element ref="metadataStandardName" minOccurs="0"/>
    <xs:element ref="metadataStandardVersion" minOccurs="0"/>
    <xs:element ref="referenceSystemInfo" minOccurs="0"/>
    <xs:element ref="identificationInfo" maxOccurs="unbounded"/>
    <xs:element ref="contentInfo" minOccurs="0"/>
    <xs:element ref="distributionInfo" minOccurs="0"/>
    <xs:element ref="dataQualityInfo" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element ref="parentIdentifier" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element ref="hierarchyLevel" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element ref="hierarchyLevelName" minOccurs="0" maxOccurs="unbounded"/>
    <!-- elements added in ET-IDM-4 to allow hierarchy identification -->
  </xs:sequence>
</xs:complexType>

<xs:element name="WMO_CommunityTopic" type="WMO_CommunityTopicCategoryCodeType"/>

<xs:complexType name="CommunityTopicCategoryCodeType">
  <xs:annotation>
    <xs:documentation>extension to allow a wildcard reference to an external community topic list, or
			a choice of the WMO commuity topics
			</xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:element ref="WMO_CommunityTopic" maxOccurs="unbounded"/>
    <xs:any namespace="##other" processContents="lax"/>
  </xs:choice>
</xs:complexType>

<xs:simpleType name="CI_DateTypeCodeType">
  <xs:annotation>
    <xs:documentation>CI_DateTypeCode  Code-List (B.5.2)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="creationDate"/>
    <xs:enumeration value="publicationDate"/>
    <xs:enumeration value="revisionDate"/>
    <xs:enumeration value="referenceDate"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="CI_RoleCodeType">
  <xs:annotation>
    <xs:documentation>CI_RoleCode CodeList  (B.5.5)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="resourceProvider"/>
    <xs:enumeration value="custodian"/>
    <xs:enumeration value="owner"/>
    <xs:enumeration value="user"/>
    <xs:enumeration value="distributor"/>
    <xs:enumeration value="originator"/>
    <xs:enumeration value="pointOfContact"/>
    <xs:enumeration value="principalInvestigator"/>
    <xs:enumeration value="processor"/>
    <xs:enumeration value="publisher"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="frequencyCodeType">
  <xs:annotation>
    <xs:documentation> Frequency code for data repetition frequency </xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="continual"/>
    <xs:enumeration value="hourly"/>
    <xs:enumeration value="3-hourly"/>
    <xs:enumeration value="6-hourly"/>
    <xs:enumeration value="12-hourly"/>
    <xs:enumeration value="daily"/>
    <xs:enumeration value="weekly"/>
    <xs:enumeration value="fortnightly"/>
    <xs:enumeration value="monthly"/>
    <xs:enumeration value="quarterly"/>
    <xs:enumeration value="biannually"/>
    <xs:enumeration value="annually"/>
    <xs:enumeration value="asNeeded"/>
    <xs:enumeration value="irregular"/>
    <xs:enumeration value="notPlanned"/>
    <xs:enumeration value="unknown"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_CharacterSetCodeType">
  <xs:annotation>
    <xs:documentation>MD_CharacterSetCode  Code-List (B.5.10)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="ucs2"/>
    <xs:enumeration value="ucs4"/>
    <xs:enumeration value="utf7"/>
    <xs:enumeration value="utf8"/>
    <xs:enumeration value="utf16"/>
    <xs:enumeration value="8859part1"/>
    <xs:enumeration value="8859part2"/>
    <xs:enumeration value="8859part3"/>
    <xs:enumeration value="8859part4"/>
    <xs:enumeration value="8859part5"/>
    <xs:enumeration value="8859part6"/>
    <xs:enumeration value="8859part7"/>
    <xs:enumeration value="8859part8"/>
    <xs:enumeration value="8859part9"/>
    <xs:enumeration value="8859part11"/>
    <xs:enumeration value="8859part14"/>
    <xs:enumeration value="8859part15"/>
    <xs:enumeration value="jis"/>
    <xs:enumeration value="shiftJIS"/>
    <xs:enumeration value="eucJP"/>
    <xs:enumeration value="usAscii"/>
    <xs:enumeration value="ebcdic"/>
    <xs:enumeration value="eucKR"/>
    <xs:enumeration value="big5"/>
    <xs:enumeration value="CP1251"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_ClassificationCodeType">
  <xs:annotation>
    <xs:documentation>MD_ClassificationCode  Code-List (B.5.11)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="unclassified"/>
    <xs:enumeration value="restricted"/>
    <xs:enumeration value="confidential"/>
    <xs:enumeration value="secret"/>
    <xs:enumeration value="topsecret"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_MaintenanceFrequencyCodeType">
  <xs:annotation>
    <xs:documentation> MD_MaintenanceFrequencyCode CodeList ( B.5.18) </xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="continual"/>
    <xs:enumeration value="hourly"/>
    <xs:enumeration value="3-hourly"/>
    <xs:enumeration value="6-hourly"/>
    <xs:enumeration value="12-hourly"/>
    <xs:enumeration value="daily"/>
    <xs:enumeration value="weekly"/>
    <xs:enumeration value="fortnightly"/>
    <xs:enumeration value="monthly"/>
    <xs:enumeration value="quarterly"/>
    <xs:enumeration value="biannually"/>
    <xs:enumeration value="annually"/>
    <xs:enumeration value="asNeeded"/>
    <xs:enumeration value="irregular"/>
    <xs:enumeration value="notPlanned"/>
    <xs:enumeration value="unknown"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_MediumNameCodeType">
  <xs:annotation>
    <xs:documentation>MD_MediumNameCode  Code-List (B.5.20)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="cdRom"/>
    <xs:enumeration value="dvd"/>
    <xs:enumeration value="dvdRom"/>
    <xs:enumeration value="5quarterInchFloppy"/>
    <xs:enumeration value="7trackTape"/>
    <xs:enumeration value="9trackTape"/>
    <xs:enumeration value="3480Cartridge"/>
    <xs:enumeration value="3490Cartridge"/>
    <xs:enumeration value="3580Cartridge"/>
    <xs:enumeration value="4mmCartridgeTape"/>
    <xs:enumeration value="8mmCartridgeTape"/>
    <xs:enumeration value="1quarterInchCartridgeTape"/>
    <xs:enumeration value="digitalLinearTape"/>
    <xs:enumeration value="onLine"/>
    <xs:enumeration value="satellite"/>
    <xs:enumeration value="telephoneLink"/>
    <xs:enumeration value="hardcopy"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_ProgressCodeType">
  <xs:annotation>
    <xs:documentation>MD_ProgressCode  Code-List (B.5.23)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="completed"/>
    <xs:enumeration value="historicalArchive"/>
    <xs:enumeration value="owner"/>
    <xs:enumeration value="onGoing"/>
    <xs:enumeration value="planned"/>
    <xs:enumeration value="required"/>
    <xs:enumeration value="underdevelopment"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_RestrictionCodeType">
  <xs:annotation>
    <xs:documentation>MD_RestrictionCode  Code-List (B.5.24)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="copyright"/>
    <xs:enumeration value="patent"/>
    <xs:enumeration value="patentPending"/>
    <xs:enumeration value="trademark"/>
    <xs:enumeration value="license"/>
    <xs:enumeration value="intellectualPropertyRights"/>
    <xs:enumeration value="restricted"/>
    <xs:enumeration value="otherRestrictions"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_ScopeCodeType">
  <xs:annotation>
    <xs:documentation>MD_ScopeCodeType (B.5.25) Hierarchy level code</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="attribute"/>
    <xs:enumeration value="attributeType"/>
    <xs:enumeration value="collectionHardware"/>
    <xs:enumeration value="collectionSession"/>
    <xs:enumeration value="dataset"/>
    <xs:enumeration value="series"/>
    <xs:enumeration value="nonGeographicDataset"/>
    <xs:enumeration value="dimensionGroup"/>
    <xs:enumeration value="feature"/>
    <xs:enumeration value="featureType"/>
    <xs:enumeration value="propertyType"/>
    <xs:enumeration value="fieldSession"/>
    <xs:enumeration value="software"/>
    <xs:enumeration value="service"/>
    <xs:enumeration value="model"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_SpatialRepresentationTypeCode">
  <xs:annotation>
    <xs:documentation>MD_SpatialRepresentationTypeCode Code-List (B.5.26)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="vector"/>
    <xs:enumeration value="grid"/>
    <xs:enumeration value="textTable"/>
    <xs:enumeration value="tin"/>
    <xs:enumeration value="stereoModel"/>
    <xs:enumeration value="video"/>
    <xs:enumeration value="bitmap"/>
    <xs:enumeration value="irregularPoints"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="MD_TopicCategoryCodeType">
  <xs:annotation>
    <xs:documentation>MD_TopicCategoryCode Code-List (B.5.27)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="farming"/>
    <xs:enumeration value="biota"/>
    <xs:enumeration value="boundaries"/>
    <xs:enumeration value="climatologyMeteorologyAtmosphere"/>
    <xs:enumeration value="economy"/>
    <xs:enumeration value="elevation"/>
    <xs:enumeration value="environment"/>
    <xs:enumeration value="geoscientificInformation"/>
    <xs:enumeration value="health"/>
    <xs:enumeration value="imageryBaseMapsEarthCover"/>
    <xs:enumeration value="intelligenceMilitary"/>
    <xs:enumeration value="inlandWaters"/>
    <xs:enumeration value="location"/>
    <xs:enumeration value="oceans"/>
    <xs:enumeration value="planningCadastre"/>
    <xs:enumeration value="society"/>
    <xs:enumeration value="structure"/>
    <xs:enumeration value="transportation"/>
    <xs:enumeration value="utilitiesCommunication"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="WMO_CommunityTopicCategoryCodeType">
  <xs:annotation>
    <xs:documentation>extension for WMO commuity topics
			This list should be extended. current list proposed byA Besprovannyk Rosydromet in ET-IDM-4
			</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="weather observations"/>
    <xs:enumeration value="weather forecasts"/>
    <xs:enumeration value="meteorology"/>
    <xs:enumeration value="hydrology"/>
    <xs:enumeration value="climatology"/>
    <xs:enumeration value="landMeteorologyClimate"/>
    <xs:enumeration value="synopticMeteorology"/>
    <xs:enumeration value="marineMeteorology"/>
    <xs:enumeration value="agriculturalMeteorology"/>
    <xs:enumeration value="aerology"/>
    <xs:enumeration value="marineAerology"/>
    <xs:enumeration value="oceanography"/>
    <xs:enumeration value="landHydrology"/>
    <xs:enumeration value="rocketSounding"/>
    <xs:enumeration value="pollution"/>
    <xs:enumeration value="waterPollution"/>
    <xs:enumeration value="landWaterPollution"/>
    <xs:enumeration value="seaPollution"/>
    <xs:enumeration value="landPollution"/>
    <xs:enumeration value="airPollution"/>
    <xs:enumeration value="glaciology"/>
    <xs:enumeration value="actinometry"/>
    <xs:enumeration value="satelliteObservation"/>
    <xs:enumeration value="airplaneObservation"/>
    <xs:enumeration value="observationPlatform"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="WMO_DataFrequencyCodeType">
  <xs:annotation>
    <xs:documentation> separate additional codelist to MD_MaintenanceFrequencyCode reflecting WMO time scales </xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="continuous"/>
    <xs:enumeration value="1-minute"/>
    <xs:enumeration value="5-minute"/>
    <xs:enumeration value="10-minute"/>
    <xs:enumeration value="15-minute"/>
    <xs:enumeration value="30-minute"/>
    <xs:enumeration value="hourly"/>
    <xs:enumeration value="3-hourly"/>
    <xs:enumeration value="6-hourly"/>
    <xs:enumeration value="8-hourly"/>
    <xs:enumeration value="12-hourly"/>
    <xs:enumeration value="daily"/>
    <xs:enumeration value="weekly"/>
    <xs:enumeration value="10-daily"/>
    <xs:enumeration value="fortnightly"/>
    <xs:enumeration value="monthly"/>
    <xs:enumeration value="quarterly"/>
    <xs:enumeration value="biannually"/>
    <xs:enumeration value="annually"/>
    <xs:enumeration value="decadally"/>
    <xs:enumeration value="irregularly"/>
  </xs:restriction>
</xs:simpleType>