<?xml version="1.0" encoding="UTF-8"?>
<chapter version="5.0" xmlns="http://docbook.org/ns/docbook"
  xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>Overview</title>
  <para>The OpenAIRE API allows developers to access the metadata information space of OpenAIRE
    programmatically.</para>
  <para>If you have any question, please open a ticket to the <link
      xlink:href="https://www.openaire.eu/support/helpdesk">OpenAIRE Helpdesk</link></para>
  <itemizedlist>
    <listitem>
      <para>Bulk access:</para>
      <simplelist>
        <member><xref linkend="cha_oai_pmh"/></member>
        <member><xref linkend="cha_projects_http"/></member>
      </simplelist>
    </listitem>
    <listitem>
      <para>Selective access via <xref linkend="cha_http-api"/></para>
      <simplelist>
        <member><xref linkend="sec_http-pubs"/></member>
        <member><xref linkend="sec_http-datasets"/></member>
        <member><xref linkend="sec_http-projects"/></member>
      </simplelist>
    </listitem>
  </itemizedlist>
  <para>The default format of delivered records is <code>oaf</code> (OpenAire Format - current
    version 0.3): <simplelist>
      <member><link xlink:href="https://www.openaire.eu/schema/0.3/oaf-0.3.xsd"/></member>
      <member><link xlink:href="https://www.openaire.eu/schema/0.3/doc/oaf-0.3.html"/></member>
    </simplelist>
  </para>
  <para>The latest versions of the XML schema and documentation are also available at the following
    links: <simplelist>
      <member><link xlink:href="https://www.openaire.eu/schema/latest/oaf.xsd"/></member>
      <member><link xlink:href="https://www.openaire.eu/schema/latest/doc/oaf.html"/></member>
    </simplelist>
  </para>
  <para>Older versions: <simplelist>
      <member><code>oaf</code> v0.2 <link
          xlink:href="https://www.openaire.eu/schema/0.2/oaf-0.2.xsd"> XML schema</link> and <link
          xlink:href="https://www.openaire.eu/schema/0.2/doc/oaf-0.2.html"
        >documentation</link></member>
      <member><code>oaf</code> v0.1 <link
          xlink:href="https://www.openaire.eu/schema/0.1/oaf-0.1.xsd"> XML schema</link> and <link
          xlink:href="https://www.openaire.eu/schema/0.1/doc/oaf-0.1.html"
        >documentation</link></member>
    </simplelist>
  </para>
</chapter>
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