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  <div class="section" id="dataone-apis">
<h1>DataONE APIs<a class="headerlink" href="#dataone-apis" title="Permalink to this headline">¶</a></h1>
<p>The DataONE infrastructure exposes application programming interfaces (APIs)
that support interaction between <a class="reference internal" href="../glossary.html#term-member-node"><span class="xref std std-term">Member Node</span></a> and <a class="reference internal" href="../glossary.html#term-coordinating-node"><span class="xref std std-term">Coordinating
Node</span></a>, and to support development of applications that interact with the
DataONE infrastructure (elements of the <a class="reference internal" href="../glossary.html#term-investigator-toolkit"><span class="xref std std-term">Investigator Toolkit</span></a>).</p>
<div class="figure" id="id1" style="width: 100%">
<img alt="../_images/componentMethods.png" src="../_images/componentMethods.png" />
<p class="caption"><span class="caption-text"><em>Figure 1.</em> Overview of the system components and the methods being called
by each component. An arrow to a target indicates the origin is calling the
method on the target.</span></p>
</div>
<p>All services in DataONE are implemented using a RESTful approach with HTTPS
(or HTTP) as the transport protocol and XML for encoding messages.</p>
<p>Member Nodes can expose different levels of functionality that equate to four
different tiers while participating in the DataONE network. The tiers and Member
Node APIs necessary to support are summarized in the table below. Also indicated
are the corresponding Coordinating Node APIs that are necessary for
functionality expressed for each tier.</p>
<table border="1" class="docutils">
<colgroup>
<col width="6%" />
<col width="31%" />
<col width="31%" />
<col width="31%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Tier</th>
<th class="head">Description</th>
<th class="head">MN APIs</th>
<th class="head">CN APIs</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>1</td>
<td>Public read, no authentication or access control of content. No content
can be created through the DataONE service interfaces. The node can not
act as a replication target.</td>
<td><a class="reference internal" href="MN_APIs.html#module-MNCore" title="MNCore: Base operations for Member Nodes"><code class="xref py py-mod docutils literal"><span class="pre">MNCore</span></code></a>, <a class="reference internal" href="MN_APIs.html#module-MNRead" title="MNRead: Provide tier 1 operations for sharing content from a Member Node."><code class="xref py py-mod docutils literal"><span class="pre">MNRead</span></code></a></td>
<td><a class="reference internal" href="CN_APIs.html#module-CNCore" title="CNCore: Core operations necessary for basic interaction with Coordinating Nodes"><code class="xref py py-mod docutils literal"><span class="pre">CNCore</span></code></a>, <a class="reference internal" href="CN_APIs.html#module-CNRead" title="CNRead: Data read operations for Coordinating Nodes"><code class="xref py py-mod docutils literal"><span class="pre">CNRead</span></code></a></td>
</tr>
<tr class="row-odd"><td>2</td>
<td>Read and resolve with access control support.</td>
<td>Tier 1 + <a class="reference internal" href="MN_APIs.html#module-MNAuthorization" title="MNAuthorization: Authorization and access control operations for Member Nodes"><code class="xref py py-mod docutils literal"><span class="pre">MNAuthorization</span></code></a></td>
<td><a class="reference internal" href="CN_APIs.html#module-CNAuthorization" title="CNAuthorization: Methods for authorization and access control"><code class="xref py py-mod docutils literal"><span class="pre">CNAuthorization</span></code></a>, <a class="reference internal" href="CN_APIs.html#module-CNRegister" title="CNRegister: Register nodes and their capabilities, retrieve node list"><code class="xref py py-mod docutils literal"><span class="pre">CNRegister</span></code></a>, <a class="reference internal" href="CN_APIs.html#module-CNIdentity" title="CNIdentity: Methods for account management and identity mapping."><code class="xref py py-mod docutils literal"><span class="pre">CNIdentity</span></code></a></td>
</tr>
<tr class="row-even"><td>3</td>
<td>Write (create, update, delete), possibly limited support for data types</td>
<td>Tier 2 + <a class="reference internal" href="MN_APIs.html#module-MNStorage" title="MNStorage: Methods for manipulating (changing) content on a Member Node"><code class="xref py py-mod docutils literal"><span class="pre">MNStorage</span></code></a></td>
<td>&nbsp;</td>
</tr>
<tr class="row-odd"><td>4</td>
<td>Replication target. The types of content supported by the node may be
limited to a subset of object formats.</td>
<td>Tier 3 + <a class="reference internal" href="MN_APIs.html#module-MNReplication" title="MNReplication: Handles CN directed replication of content between Member Nodes."><code class="xref py py-mod docutils literal"><span class="pre">MNReplication</span></code></a></td>
<td><a class="reference internal" href="CN_APIs.html#module-CNReplication" title="CNReplication: Supports operations for replication of content between Member Nodes."><code class="xref py py-mod docutils literal"><span class="pre">CNReplication</span></code></a></td>
</tr>
</tbody>
</table>
<p>The specific methods that must be implemented for each tier are listed in the
respective APIs.</p>
<p><strong>Contents</strong></p>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="rest_comms.html">REST Interface Overview</a></li>
<li class="toctree-l1"><a class="reference internal" href="MN_APIs.html">Member Node APIs</a></li>
<li class="toctree-l1"><a class="reference internal" href="CN_APIs.html">Coordinating Node APIs</a></li>
<li class="toctree-l1"><a class="reference internal" href="ITK_APIs.html">Investigator Toolkit APIs</a></li>
<li class="toctree-l1"><a class="reference internal" href="Types.html">Version 1.0 Data Types</a></li>
<li class="toctree-l1"><a class="reference internal" href="Types11.html">Version 1.1 Data Types (extend v1.0)</a></li>
<li class="toctree-l1"><a class="reference internal" href="Types2.html">Version 2.0 Data Types (extend v1.1)</a></li>
<li class="toctree-l1"><a class="reference internal" href="Exceptions.html">Exceptions Raised by MN and CN APIs</a></li>
<li class="toctree-l1"><a class="reference internal" href="monitoring.html">Infrastructure Monitoring APIs</a></li>
<li class="toctree-l1"><a class="reference internal" href="CN_internal_APIs.html">APIs Internal to Coordinating Nodes</a></li>
</ul>
</div>
</div>


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