DOI resolution by country code

Crossref's implementation of multiple resolution supports a form of appropriate copy based on the country of origin of the user requesting the resolution service. This service allows a content owner to deposit multiple URLs for a single DOI, each of which is intended to service users from a particular country. The DOI resolver will determine the resolution request's country of origin and select the appropriate URL target based on country codes (available here).

The country code and URL information are supplied within the <collection> element, and can be deposited as part of a primary metadata deposit or as a resource deposit. If a country code is not supplied, the DOI will resolve to the URL supplied in the top level resource element .

Metadata deposit:

<doi_data>
   <doi>10.5555/ilovedois</doi>
      <resource>http://www.crossref.org/hello</resource>  default URL
      <collection property="country-based">
           <item country="US">
               <resource>http://www.crossref.org/howdy</resource> USA URL
            </item>
            <item country="SE">
               <resource>http://www.crossref.org/hej</resource> Sweden URL
            </item>
            <item country="KE">
               <resource>http://www.crossref.org/hujambo</resource> Kenya URL
            </item>
      </collection>
</doi_data>

Resource-only deposit:

<doi_resources>
   <doi>10.5555/ilovedois</doi>
   <collection property="country-based">
     <item country="US">
       <resource>http://www.crossref.org/howdy</resource> USA URL
     </item>
     <item country="SE">
       <resource>http://www.crossref.org/hej</resource> Sweden URL
     </item>
     <item country="KE">
       <resource>http://www.crossref.org/hujambo</resource> Kenya URL
     </item>
   </collection>
</doi_resources>