<schema targetNamespace=“www.openarchives.org/OAI/2.0/oai-identifier

xmlns:oai-identifier="http://www.openarchives.org/OAI/2.0/oai-identifier"
xmlns="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified">

<annotation>
  <documentation>
    Schema for description section of Identify reply of OAI-PMH v2.0.
    For repositories that comply with the oai format for unique identifiers 
    for items records. 
    See: http://www.openarchives.org/OAI/2.0/guidelines-oai-identifier.htm
    Validated with http://www.w3.org/2001/03/webdata/xsv on 2002-05-16 
    Corrected to handle single letter elements in domain name, e.g ebibpol.p.lodz.pl 2007-05-22
    Simeon Warner $Date: 2007-06-07 19:28:11 $
  </documentation>
</annotation>

<element name="oai-identifier" type="oai-identifier:oai-identifierType"/>

<complexType name="oai-identifierType">
  <sequence>
    <element name="scheme" minOccurs="1" maxOccurs="1" 
             type="string" fixed="oai"/>
    <element name="repositoryIdentifier" minOccurs="1" maxOccurs="1" 
             type="oai-identifier:repositoryIdentifierType"/>
    <element name="delimiter" minOccurs="1" maxOccurs="1"
             type="string" fixed=":"/>
    <element name="sampleIdentifier" minOccurs="1" maxOccurs="1" 
             type="oai-identifier:sampleIdentifierType"/>
  </sequence>
</complexType>

<simpleType name="repositoryIdentifierType">
  <restriction base="string">
    <pattern value="[a-zA-Z][a-zA-Z0-9\-]*(\.[a-zA-Z][a-zA-Z0-9\-]*)+"/>
  </restriction>
</simpleType>

<simpleType name="sampleIdentifierType">
  <restriction base="string">
    <pattern value="oai:[a-zA-Z][a-zA-Z0-9\-]*(\.[a-zA-Z][a-zA-Z0-9\-]*)+:[a-zA-Z0-9\-_\.!~\*&apos;\(\);/\?:@&amp;=\+$,%]+"/>
    <!--meta ., \, ?, *, +, {, } (, ), [ or ] -->
  </restriction>
</simpleType>

</schema>