Data policy is many kinds of constraints imposed on the information resource. Data policy is mostly described in the element MD_Metadata/identificationInfo/*/resourceConstraints, and intended scope of distribution is described in MD_Metadata/identificationInfo/*/descriptiveKeyowrds.

Following parts of this page provide guidance and examples on how to implement different data policies using the WMO CORE Profile 1.3. See the page MDG_DataPolicy about description of these policies.

Data/product delivered on the GTS

The following data policies are applicable to the products intended to be distributed on the GTS.

There are three cases covered in the document: the data intended for global exchange, for regional exchange and bilateral exchange.

Data intended for Global Exchange

When the data is intended for Global Exchange, the following checklist applies:

1. Add a resourceContraints Element as defined below
2. Choose the applicable WMO Policy: WMOAdditional, WMOEssential, WMOOther
3. Add the corresponding GTSPriority
4. Use the MD_RestrictionCode code from the WMO Code list WMOCodeLists.xml in the resourceConstraints Element
5. Add a descriptive keyword to define the scope of distribution as demonstrated below.

Note that WMOAdditional is used to qualify products under the “WMO Additional” data policy, WMOEssential is used for “WMO Essential” products and WMOOther for all the other applicable data policies for data circulating on the GTS.

Below is the resourceConstraints element for a WMO Essential GTS product intended for Global exchange.

<!-- Data intended for WMOEssential data intended for Global exchange (point 1) -->
<gmd:resourceConstraints>
  <gmd:MD_LegalConstraints>      
    <gmd:accessConstraints>
      <!-- Restriction code have to point to WMOCodeLists.xml (point 4) -->
      <gmd:MD_RestrictionCode
       codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#MD_RestrictionCode"
       codeListValue="otherRestrictions">otherRestrictions</gmd:MD_RestrictionCode>
    </gmd:accessConstraints>
    <gmd:useConstraints>
      <gmd:MD_RestrictionCode
       codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#MD_RestrictionCode"
       codeListValue="otherRestrictions">otherRestrictions</gmd:MD_RestrictionCode>
    </gmd:useConstraints>
    <!-- Add WMO Data policy and GTSPriority (see point 2 and 3) -->
    <gmd:otherConstraints>
      <gco:CharacterString>WMOEssential</gco:CharacterString>
    </gmd:otherConstraints>
      <gmd:otherConstraints>
        <gco:CharacterString>GTSPriority2</gco:CharacterString>
      </gmd:otherConstraints>
  </gmd:MD_LegalConstraints>
</gmd:resourceConstraints>

In addition the scope of distribution has to be stated:

<!-- keyword for stating the scope of distribution: Global Exchange (point 5) -->
<gmd:descriptiveKeywords>
  <gmd:MD_Keywords>
    <gmd:keyword>
      <gco:CharacterString>GlobalExchange</gco:CharacterString>
    </gmd:keyword>
    <gmd:type>
      <gmd:MD_KeywordTypeCode
       codeList="http://wis.wmo.int/2012/codelists/WMOCodeLists.xml#MD_DistributionScopeCode"
       codeListValue="dataCentre">dataCentre</gmd:MD_KeywordTypeCode>
    </gmd:type>
      <gmd:thesaurusName>
        <gmd:CI_Citation>
          <gmd:title>
            <gco:CharacterString>WMO_DistributionScopeCode</gco:CharacterString>
          </gmd:title>
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>2012-06-27Z</gco:Date>
              </gmd:date>
              <gmd:dateType>
            <gmd:CI_DateTypeCode
             codeList="http://wis.wmo.int/2012/codelists/WMOCodeLists.xml#CI_DateTypeCode"
             codeListValue="publication">publication</gmd:CI_DateTypeCode>
              </gmd:dateType>
            </gmd:CI_Date>
          </gmd:date>
        </gmd:CI_Citation>
      </gmd:thesaurusName>
  </gmd:MD_Keywords>
</gmd:descriptiveKeywords>

Data intended for Regional Exchange

Data intended for Bilateral Exchange

Data/Product not delivered on GTS

DCPC/NC Data not delivered on the GTS with a specific data policy applicable in the WMO context

DCPC/NC not delivered on the GTS with multiple specific data policies and one applicable in the WMO context

DCPC/NC not delivered on the GTS an freely available