Inspect the instance document under test to assess  whether one and only one instance of a term from the WMO_DataLicenseCode code  list is specified using the following XPath: 
            
                
                  | /gmd:MD_Metadata/gmd:identificationInfo//gmd:resourceConstraints/ | 
                
                  |  | ↘gmd:MD_LegalConstaints/gmd:otherConstraints// | 
              
            A normative version of the WMO_DataLicenseCode code  list is published by WMO at: http://wis.wmo.int/2012/codelists/WMOCodeLists.xml
            A gmx:Anchor element may be used to specify the location of the Code List; e.g.
            
                
                  | /gmd:MD_Metadata/gmd:identificationInfo//gmd:resourceConstraints/ | 
                
                  |  | ↘gmd:MD_LegalConstaints/gmd:otherConstraints/gmx:Anchor/@xlink:href  = “http://wis.wmo.int/2012/codelists/WMOCodeLists.xml#WMO_DataLicenseCode” |