<? xml version="1.0" encoding="UTF-8"? >
<!--  Version 1.0 - Created 2011-01-13 - FZ, TIB, Germany
  2013-05 v3.0: Addition of ID to simpleType element; addition of value "PMID"
  2014-08-20 v3.1: Addition of values "arxiv" and "bibcode"
  2015-02-12 v4.0 Addition of value "IGSN" -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://datacite.org/schema/kernel-4" targetNamespace="http://datacite.org/schema/kernel-4" elementFormDefault="qualified">
  <xs:simpleType name="relatedIdentifierType" id="relatedIdentifierType">
    <xs:annotation>
      <xs:documentation>The type of the RelatedIdentifier.</xs:documentation>
    </xs:annotation>
    <xs:restriction base="xs:string">
      <xs:enumeration value="ARK"/>
      <xs:enumeration value="arXiv"/>
      <xs:enumeration value="bibcode"/>
      <xs:enumeration value="DOI"/>
      <xs:enumeration value="EAN13"/>
      <xs:enumeration value="EISSN"/>
      <xs:enumeration value="Handle"/>
      <xs:enumeration value="IGSN"/>
      <xs:enumeration value="ISBN"/>
      <xs:enumeration value="ISSN"/>
      <xs:enumeration value="ISTC"/>
      <xs:enumeration value="LISSN"/>
      <xs:enumeration value="LSID"/>
      <xs:enumeration value="PMID"/>
      <xs:enumeration value="PURL"/>
      <xs:enumeration value="UPC"/>
      <xs:enumeration value="URL"/>
      <xs:enumeration value="URN"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>
