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Resource locator: URL

Name Resource locator (datasets and dataset series)
Definition Location (address) for online access using a Uniform Resource Locator (URL) address or similar address system.
Obligation
  • dataset or dataset series: conditional; mandatory if there is URL available providing additional information about the resource and/or service related to resource access. 
Multiplicity [0..*]
Example http://rgi.dgu.hr
The source URL should be correct and provide a link:
 
  • for direct access to download data,
  • on spatial data service capabilities (eg OGC GetCapabilities),
  • to the WSDL Spatial Data Services (SOAP) document,
  • to a client application that provides direct access to data,
  • to web pages with further instructions on how to access the data.

The resource locator can be described by additional elements such as title, description and function. In this case, the title and description are free text, and the function should contain the members of the ISO 19139 CI_OnLineFunctionCode code list. For example:
 
  • Resource locator: http://rgi.dgu.hr,
  • Title: Geographical names of the Republic of Croatia,
  • Description: A browser that allows searching the database of geographical names,
  • Function: "information".

Tehnical data
 
 INSPIRE equivalent Resource locator
Comparison with INSPIRE equivalent
ISO equivalent [397] linkage
Comparison with ISO equivalent
XPath distributionInfo/*/transferOptions/*/onLine/*/linkage
Data type URL
Domain URL (IETF RFC1738 i IETF RFC 2056)
Implementation instructions The URL(s) of network services to access data of the dataset or dataset series must be added, if data access is available. If access to data is not available, a URL must be provided where more information about the source, if any, can be obtained. Resource locator is documented in the gmd:transferOptions/gmd:MD_DigitalTransferOptions/gmd:onLine/gmd:CI_OnlineResource/ gmd:linkage/gmd:URL element.

Encoding example: Documenting resource locator and additional descriptive elements
 
<gmd:MD_Metadata...
...
     <gmd:distributionInfo>
         <gmd:MD_Distribution>
...
             <gmd:transferOptions>
                 <gmd:MD_DigitalTransferOptions>
                     <gmd:onLine>
                         <gmd:CI_OnlineResource>
                             <gmd:linkage>
                                 <gmd:URL>http://rgi.dgu.hr</gmd:URL>
                             </gmd:linkage>
                        <gmd:name>
                             <gco:CharacterString>Geographical names of the Republic of Croatia</gco:CharacterString>
                        </gmd:name>
                        <gmd:description>
                            <gco:CharacterString>A browser that allows searching the database of geographical names.</gco:CharacterString>
                        </gmd:description>
                        <gmd:function>
                            <gmd:CI_OnLineFunctionCode
codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
                        </gmd:function>
                           </gmd:CI_OnlineResource>
                     </gmd:onLine>
                 </gmd:MD_DigitalTransferOptions>
             </gmd:transferOptions>
         </gmd:MD_Distribution>
     </gmd:distributionInfo>
...
</gmd:MD_Metadata>