<?xml version="1.0" encoding="UTF-8"?>
<gmd:MD_Metadata xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gco="http://www.isotc211.org/2005/gco" xmlns:gml="http://www.opengis.net/gml" xmlns:gmx="http://www.isotc211.org/2005/gmx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.isotc211.org/2005/gmd http://www.isotc211.org/2005/gmd/gmd.xsd http://www.isotc211.org/2005/gmx http://www.isotc211.org/2005/gmx/gmx.xsd">
  <gmd:fileIdentifier>
    <gco:CharacterString>edu.ucar.gdex::d583101</gco:CharacterString>
  </gmd:fileIdentifier>
  <gmd:language>
    <gmd:LanguageCode codeList="http://www.loc.gov/standards/iso639-2/" codeListValue="eng; USA">eng; USA</gmd:LanguageCode>
  </gmd:language>
  <gmd:characterSet>
    <gmd:MD_CharacterSetCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_CharacterSetCode" codeListValue="utf8">utf-8</gmd:MD_CharacterSetCode>
  </gmd:characterSet>
  <gmd:hierarchyLevel>
    <gmd:MD_ScopeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="dataset">dataset</gmd:MD_ScopeCode>
  </gmd:hierarchyLevel>
  <gmd:contact>
    <gmd:CI_ResponsibleParty>
      <gmd:organisationName>
        <gco:CharacterString>NSF NCAR Geoscience Data Exchange</gco:CharacterString>
      </gmd:organisationName>
      <gmd:contactInfo>
        <gmd:CI_Contact>
          <gmd:address>
            <gmd:CI_Address>
              <gmd:electronicMailAddress>
                <gco:CharacterString>datahelp@ucar.edu</gco:CharacterString>
              </gmd:electronicMailAddress>
            </gmd:CI_Address>
          </gmd:address>
          <gmd:onlineResource>
            <gmd:CI_OnlineResource>
              <gmd:linkage>
                <gmd:URL>https://gdex.ucar.edu</gmd:URL>
              </gmd:linkage>
              <gmd:name>
                <gco:CharacterString>NSF NCAR Geoscience Data Exchange</gco:CharacterString>
              </gmd:name>
              <gmd:description>
                <gco:CharacterString>The Geoscience Data Exchange (GDEX), managed by the Computational and Information Systems Laboratory (CISL) at NSF NCAR, contains a large collection of meteorological, atmospheric composition, and oceanographic observations, and operational and reanalysis model outputs, integrated with NSF NCAR High Performance Compute services to support atmospheric and geosciences research.</gco:CharacterString>
              </gmd:description>
              <gmd:function>
                <gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>
              </gmd:function>
            </gmd:CI_OnlineResource>
          </gmd:onlineResource>
        </gmd:CI_Contact>
      </gmd:contactInfo>
      <gmd:role>
        <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode>
      </gmd:role>
    </gmd:CI_ResponsibleParty>
  </gmd:contact>
  <gmd:dateStamp>
    <gco:DateTime>2026-04-22T03:12:51Z</gco:DateTime>
  </gmd:dateStamp>
  <gmd:metadataStandardName>
    <gco:CharacterString>ISO 19115 Geographic Information - Metadata</gco:CharacterString>
  </gmd:metadataStandardName>
  <gmd:metadataStandardVersion>
    <gco:CharacterString>ISO19115:2003/Cor 1 2006</gco:CharacterString>
  </gmd:metadataStandardVersion>
  <gmd:dataSetURI>
    <gco:CharacterString>https://doi.org/10.5065/231h-jw06</gco:CharacterString>
  </gmd:dataSetURI>
  <gmd:identificationInfo>
    <gmd:MD_DataIdentification>
      <gmd:citation>
        <gmd:CI_Citation>
          <gmd:title>
            <gco:CharacterString>MPD OSSE data</gco:CharacterString>
          </gmd:title>
          <gmd:alternateTitle>
            <gco:CharacterString>d583101</gco:CharacterString>
          </gmd:alternateTitle>
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>2021-10-18</gco:Date>
              </gmd:date>
              <gmd:dateType>
                <gmd:CI_DateTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="publication">publication</gmd:CI_DateTypeCode>
              </gmd:dateType>
            </gmd:CI_Date>
          </gmd:date>
          <gmd:citedResponsibleParty>
            <gmd:CI_ResponsibleParty>
              <gmd:individualName>
                <gmx:Anchor xlink:href="http://orcid.org/0000-0002-3189-6706" xlink:title="Junkyung Kay" xlink:actuate="onRequest">Kay, Junkyung</gmx:Anchor>
              </gmd:individualName>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="author">author</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:citedResponsibleParty>
          <gmd:citedResponsibleParty>
            <gmd:CI_ResponsibleParty>
              <gmd:individualName>
                <gmx:Anchor xlink:href="http://orcid.org/0000-0003-3238-9156" xlink:title="Tammy M. Weckwerth" xlink:actuate="onRequest">Weckwerth, Tammy M.</gmx:Anchor>
              </gmd:individualName>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="author">author</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:citedResponsibleParty>
          <gmd:citedResponsibleParty>
            <gmd:CI_ResponsibleParty>
              <gmd:individualName>
                <gmx:Anchor xlink:href="http://orcid.org/0000-0002-7005-881X" xlink:title="Wen-Chau Lee" xlink:actuate="onRequest">Lee, Wen-Chau</gmx:Anchor>
              </gmd:individualName>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="author">author</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:citedResponsibleParty>
          <gmd:citedResponsibleParty>
            <gmd:CI_ResponsibleParty>
              <gmd:individualName>
                <gmx:Anchor xlink:href="http://orcid.org/0000-0001-6048-6362" xlink:title="Juanzhen Sun" xlink:actuate="onRequest">Sun, Juanzhen</gmx:Anchor>
              </gmd:individualName>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="author">author</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:citedResponsibleParty>
          <gmd:citedResponsibleParty>
            <gmd:CI_ResponsibleParty>
              <gmd:individualName>
                <gmx:Anchor xlink:href="http://orcid.org/0000-0003-3997-2627" xlink:title="Glen S. Romine" xlink:actuate="onRequest">Romine, Glen S.</gmx:Anchor>
              </gmd:individualName>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="author">author</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:citedResponsibleParty>
          <gmd:citedResponsibleParty>
            <gmd:CI_ResponsibleParty>
              <gmd:organisationName>
                <gco:CharacterString>NSF National Center for Atmospheric Research</gco:CharacterString>
              </gmd:organisationName>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="publisher">publisher</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:citedResponsibleParty>
        </gmd:CI_Citation>
      </gmd:citation>
      <gmd:abstract>
        <gco:CharacterString>This numerical simulation data set is prepared for manuscript submission to the the Monthly Weather Review journal of the American Meteorological Society (AMS).

The National Center for Atmospheric Research (NCAR) and Montana State University jointly developed water vapor MicroPulse Differential absorption lidars (MPDs) that are a significant advance in eye-safe, unattended, lidar-based water vapor remote sensing. We perform Observation System Simulation Experiments (OSSEs) to investigate MPD observation impact and its scientific significance of MPDs for convective weather analysis and predictions. In this study, the Data Assimilation Research Testbed (DART) and the Advanced Research version of the Weather Research and Forecasting model (WRF-ARW) are used to conduct OSSEs for a case study of a mesoscale convective system (MCS). We will submit OSSE results to the Monthly Weather Review journal of the American Meteorological Society (AMS). As this Journal is committed to the FAIR principles, all data used in the manuscript must be archived and cited/referenced properly. The dataset also have persistent identifiers such as DOIs.</gco:CharacterString>
      </gmd:abstract>
      <gmd:status>
        <gmd:MD_ProgressCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="completed">completed</gmd:MD_ProgressCode>
      </gmd:status>
      <gmd:pointOfContact>
        <gmd:CI_ResponsibleParty>
          <gmd:contactInfo>
            <gmd:CI_Contact>
              <gmd:address>
                <gmd:CI_Address>
                  <gmd:electronicMailAddress>
                    <gco:CharacterString>datahelp@ucar.edu</gco:CharacterString>
                  </gmd:electronicMailAddress>
                </gmd:CI_Address>
              </gmd:address>
            </gmd:CI_Contact>
          </gmd:contactInfo>
          <gmd:role>
            <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode>
          </gmd:role>
        </gmd:CI_ResponsibleParty>
      </gmd:pointOfContact>
      <gmd:resourceMaintenance>
        <gmd:MD_MaintenanceInformation>
          <gmd:maintenanceAndUpdateFrequency>
            <gmd:MD_MaintenanceFrequencyCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="notPlanned">notPlanned</gmd:MD_MaintenanceFrequencyCode>
          </gmd:maintenanceAndUpdateFrequency>
          <gmd:updateScope>
            <gmd:MD_ScopeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="dataset">dataset</gmd:MD_ScopeCode>
          </gmd:updateScope>
        </gmd:MD_MaintenanceInformation>
      </gmd:resourceMaintenance>
      <gmd:graphicOverview>
        <gmd:MD_BrowseGraphic>
          <gmd:fileName>
            <gco:CharacterString>https://gdex.ucar.edu/images/ds_logos/default_200_200.png</gco:CharacterString>
          </gmd:fileName>
          <gmd:fileDescription>
            <gco:CharacterString>Logo thumbnail from URL</gco:CharacterString>
          </gmd:fileDescription>
          <gmd:fileType>
            <gco:CharacterString>png</gco:CharacterString>
          </gmd:fileType>
        </gmd:MD_BrowseGraphic>
      </gmd:graphicOverview>
      <gmd:resourceFormat>
        <gmd:MD_Format>
          <gmd:name>
            <gco:CharacterString>HDF5/NetCDF4</gco:CharacterString>
          </gmd:name>
          <gmd:version gco:nilReason="inapplicable"/>
        </gmd:MD_Format>
      </gmd:resourceFormat>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>dataset</gco:CharacterString>
          </gmd:keyword>
          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>Resource Type</gco:CharacterString>
              </gmd:title>
              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2021-03-30</gco:Date>
                  </gmd:date>
                  <gmd:dateType>
                    <gmd:CI_DateTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
                  </gmd:dateType>
                </gmd:CI_Date>
              </gmd:date>
              <gmd:edition>
                <gco:CharacterString>4.4</gco:CharacterString>
              </gmd:edition>
              <gmd:citedResponsibleParty>
                <gmd:CI_ResponsibleParty>
                  <gmd:organisationName>
                    <gco:CharacterString>DataCite Metadata Working Group</gco:CharacterString>
                  </gmd:organisationName>
                  <gmd:role>
                    <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="originator">orginator</gmd:CI_RoleCode>
                  </gmd:role>
                </gmd:CI_ResponsibleParty>
              </gmd:citedResponsibleParty>
              <gmd:otherCitationDetails>
                <gco:CharacterString>resourceTypeGeneral</gco:CharacterString>
              </gmd:otherCitationDetails>
            </gmd:CI_Citation>
          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>WRF &gt; Weather Research and Forecasting (WRF) Model</gco:CharacterString>
          </gmd:keyword>
          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>U.S. National Aeronautics and Space Administration Global Change Master Directory</gco:CharacterString>
              </gmd:title>
              <gmd:alternateTitle>
                <gco:CharacterString>GCMD</gco:CharacterString>
              </gmd:alternateTitle>
              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2026-04-15</gco:Date>
                  </gmd:date>
                  <gmd:dateType>
                    <gmd:CI_DateTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
                  </gmd:dateType>
                </gmd:CI_Date>
              </gmd:date>
              <gmd:edition>
                <gco:CharacterString>23.7</gco:CharacterString>
              </gmd:edition>
              <gmd:citedResponsibleParty>
                <gmd:CI_ResponsibleParty>
                  <gmd:organisationName>
                    <gco:CharacterString>NASA Global Change Master Directory</gco:CharacterString>
                  </gmd:organisationName>
                  <gmd:role>
                    <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="originator">orginator</gmd:CI_RoleCode>
                  </gmd:role>
                </gmd:CI_ResponsibleParty>
              </gmd:citedResponsibleParty>
              <gmd:otherCitationDetails>
                <gco:CharacterString>Valids List: Platforms</gco:CharacterString>
              </gmd:otherCitationDetails>
            </gmd:CI_Citation>
          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>EARTH SCIENCE &gt; ATMOSPHERE &gt; ATMOSPHERIC WATER VAPOR &gt; WATER VAPOR PROFILES &gt; VERTICALLY RESOLVED BACKSCATTER LIGHT</gco:CharacterString>
          </gmd:keyword>
          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>U.S. National Aeronautics and Space Administration Global Change Master Directory</gco:CharacterString>
              </gmd:title>
              <gmd:alternateTitle>
                <gco:CharacterString>GCMD</gco:CharacterString>
              </gmd:alternateTitle>
              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2026-04-15</gco:Date>
                  </gmd:date>
                  <gmd:dateType>
                    <gmd:CI_DateTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
                  </gmd:dateType>
                </gmd:CI_Date>
              </gmd:date>
              <gmd:edition>
                <gco:CharacterString>23.7</gco:CharacterString>
              </gmd:edition>
              <gmd:citedResponsibleParty>
                <gmd:CI_ResponsibleParty>
                  <gmd:organisationName>
                    <gco:CharacterString>NASA Global Change Master Directory</gco:CharacterString>
                  </gmd:organisationName>
                  <gmd:role>
                    <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="originator">orginator</gmd:CI_RoleCode>
                  </gmd:role>
                </gmd:CI_ResponsibleParty>
              </gmd:citedResponsibleParty>
              <gmd:otherCitationDetails>
                <gco:CharacterString>Valids List: Science and Services Keywords</gco:CharacterString>
              </gmd:otherCitationDetails>
            </gmd:CI_Citation>
          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:resourceConstraints>
        <gmd:MD_LegalConstraints>
          <gmd:useLimitation>
            <gco:CharacterString>Creative Commons Attribution 4.0 International License</gco:CharacterString>
          </gmd:useLimitation>
          <gmd:otherConstraints>
            <gco:CharacterString>None</gco:CharacterString>
          </gmd:otherConstraints>
        </gmd:MD_LegalConstraints>
      </gmd:resourceConstraints>
      <gmd:language>
        <gco:CharacterString>eng</gco:CharacterString>
      </gmd:language>
      <gmd:characterSet>
        <gmd:MD_CharacterSetCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_CharacterSetCode" codeListValue="utf8">utf-8</gmd:MD_CharacterSetCode>
      </gmd:characterSet>
      <gmd:topicCategory>
        <gmd:MD_TopicCategoryCode>climatologyMeteorologyAtmosphere</gmd:MD_TopicCategoryCode>
      </gmd:topicCategory>
      <gmd:extent>
        <gmd:EX_Extent>
          <gmd:temporalElement>
            <gmd:EX_TemporalExtent>
              <gmd:extent>
                <gml:TimePeriod gml:id="d583101_time_period">
                  <gml:beginPosition>2015-07-15</gml:beginPosition>
                  <gml:endPosition>2015-07-15</gml:endPosition>
                </gml:TimePeriod>
              </gmd:extent>
            </gmd:EX_TemporalExtent>
          </gmd:temporalElement>
        </gmd:EX_Extent>
      </gmd:extent>
    </gmd:MD_DataIdentification>
  </gmd:identificationInfo>
  <gmd:distributionInfo>
    <gmd:MD_Distribution>
      <gmd:distributor>
        <gmd:MD_Distributor>
          <gmd:distributorContact>
            <gmd:CI_ResponsibleParty>
              <gmd:organisationName>
                <gco:CharacterString>NSF NCAR Geoscience Data Exchange</gco:CharacterString>
              </gmd:organisationName>
              <gmd:contactInfo>
                <gmd:CI_Contact>
                  <gmd:address>
                    <gmd:CI_Address>
                      <gmd:electronicMailAddress>
                        <gco:CharacterString>datahelp@ucar.edu</gco:CharacterString>
                      </gmd:electronicMailAddress>
                    </gmd:CI_Address>
                  </gmd:address>
                  <gmd:onlineResource>
                    <gmd:CI_OnlineResource>
                      <gmd:linkage>
                        <gmd:URL>https://gdex.ucar.edu</gmd:URL>
                      </gmd:linkage>
                    </gmd:CI_OnlineResource>
                  </gmd:onlineResource>
                </gmd:CI_Contact>
              </gmd:contactInfo>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="distributor">distributor</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:distributorContact>
        </gmd:MD_Distributor>
      </gmd:distributor>
      <gmd:transferOptions>
        <gmd:MD_DigitalTransferOptions>
          <gmd:transferSize>
            <gco:Real>258780.987</gco:Real>
          </gmd:transferSize>
          <gmd:onLine>
            <gmd:CI_OnlineResource>
              <gmd:linkage>
                <gmd:URL>https://gdex.ucar.edu/datasets/d583101/</gmd:URL>
              </gmd:linkage>
              <gmd:protocol>
                <gco:CharacterString>https</gco:CharacterString>
              </gmd:protocol>
              <gmd:name>
                <gco:CharacterString>Dataset Description</gco:CharacterString>
              </gmd:name>
              <gmd:description>
                <gco:CharacterString>Related Link</gco:CharacterString>
              </gmd:description>
              <gmd:function>
                <gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
              </gmd:function>
            </gmd:CI_OnlineResource>
          </gmd:onLine>
          <gmd:onLine>
            <gmd:CI_OnlineResource>
              <gmd:linkage>
                <gmd:URL>https://gdex.ucar.edu/datasets/d583101/dataaccess/</gmd:URL>
              </gmd:linkage>
              <gmd:protocol>
                <gco:CharacterString>https</gco:CharacterString>
              </gmd:protocol>
              <gmd:name>
                <gco:CharacterString>Data Access</gco:CharacterString>
              </gmd:name>
              <gmd:description>
                <gco:CharacterString>Related Link</gco:CharacterString>
              </gmd:description>
              <gmd:function>
                <gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>
              </gmd:function>
            </gmd:CI_OnlineResource>
          </gmd:onLine>
        </gmd:MD_DigitalTransferOptions>
      </gmd:transferOptions>
    </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:metadataConstraints>
    <gmd:MD_Constraints>
      <gmd:useLimitation>
        <gco:CharacterString>none</gco:CharacterString>
      </gmd:useLimitation>
    </gmd:MD_Constraints>
  </gmd:metadataConstraints>
  <gmd:metadataMaintenance>
    <gmd:MD_MaintenanceInformation>
      <gmd:maintenanceAndUpdateFrequency>
        <gmd:MD_MaintenanceFrequencyCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
      </gmd:maintenanceAndUpdateFrequency>
    </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
</gmd:MD_Metadata>
