datacite/orcid_client

<?xml version="1.0" encoding="UTF-8"?>
<external-identifier:external-identifier
    xmlns:external-identifier="http://www.orcid.org/ns/external-identifier"
    xmlns:common="http://www.orcid.org/ns/common" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.orcid.org/ns/external-identifier ../person-external-identifier-2.1.xsd ">
    <common:external-id-type>My ID System</common:external-id-type>
    <common:external-id-value>A-0003</common:external-id-value>
    <common:external-id-url>https://myid.com/A-0003</common:external-id-url>
    <common:external-id-relationship>self</common:external-id-relationship>    
</external-identifier:external-identifier>