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<li><span class="section-nav-list-main-title">Documentation</span></li>
<li><a href="{{ site.baseurl }}/documentation">Using the Documentation</a></li>
<li><a href="{{ site.baseurl }}/documentation/execution-model">Beam Execution Model</a></li>
<li>
  <span class="section-nav-list-title">Pipeline development lifecycle</span>

  <ul class="section-nav-list">
    <li><a href="{{ site.baseurl }}/documentation/pipelines/design-your-pipeline/">Design Your Pipeline</a></li>
    <li><a href="{{ site.baseurl }}/documentation/pipelines/create-your-pipeline/">Create Your Pipeline</a></li>
    <li><a href="{{ site.baseurl }}/documentation/pipelines/test-your-pipeline/">Test Your Pipeline</a></li>
  </ul>
</li>
<li>
  <span class="section-nav-list-title">Beam programming guide</span>

  <ul class="section-nav-list">
    <li><a href="{{ site.baseurl }}/documentation/programming-guide/">Overview</a></li>
    <li><a href="{{ site.baseurl }}/documentation/programming-guide/#creating-a-pipeline">Pipelines</a></li>
    <li class="section-nav-item--collapsible">
      <span class="section-nav-list-title">PCollections</span>

      <ul class="section-nav-list">
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#pcollections">Creating a PCollection</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#pcollection-characteristics">PCollection characteristics</a></li>
      </ul>
    </li>
    <li class="section-nav-item--collapsible">
      <span class="section-nav-list-title">Transforms</span>

      <ul class="section-nav-list">
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#applying-transforms">Applying transforms</a></li>
        <li>
          <span class="section-nav-list-title">Core Beam transforms</span>

          <ul class="section-nav-list">
            <li><a href="{{ site.baseurl }}/documentation/programming-guide/#pardo">ParDo</a></li>
            <li><a href="{{ site.baseurl }}/documentation/programming-guide/#groupbykey">GroupByKey</a></li>
            <li><a href="{{ site.baseurl }}/documentation/programming-guide/#cogroupbykey">CoGroupByKey</a></li>
            <li><a href="{{ site.baseurl }}/documentation/programming-guide/#combine">Combine</a></li>
            <li><a href="{{ site.baseurl }}/documentation/programming-guide/#flatten">Flatten</a></li>
            <li><a href="{{ site.baseurl }}/documentation/programming-guide/#partition">Partition</a></li>
          </ul>
        </li>

        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#requirements-for-writing-user-code-for-beam-transforms">Requirements for user code</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#side-inputs">Side inputs</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#additional-outputs">Additional outputs</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#composite-transforms">Composite transforms</a></li>
      </ul>
    </li>
    <li class="section-nav-item--collapsible">
      <span class="section-nav-list-title">Pipeline I/O</span>

      <ul class="section-nav-list">
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#pipeline-io">Using I/O transforms</a></li>
        <li><a href="{{ site.baseurl }}/documentation/io/built-in/">Built-in I/O connectors</a></li>

        <li class="section-nav-item--collapsible">
           <span class="section-nav-list-title">Developing new I/O connectors</span>

          <ul class="section-nav-list">
           <li><a href="{{ site.baseurl }}/documentation/io/developing-io-overview/">Overview: Developing connectors</a></li>
           <li><a href="{{ site.baseurl }}/documentation/io/developing-io-java/">Developing connectors (Java)</a></li>
           <li><a href="{{ site.baseurl }}/documentation/io/developing-io-python/">Developing connectors (Python)</a></li>
          </ul>
        </li>

        <li><a href="{{ site.baseurl }}/documentation/io/testing/">Testing I/O transforms</a></li>
      </ul>
    </li>
    <li class="section-nav-item--collapsible">
      <span class="section-nav-list-title">Data encoding and type safety</span>

      <ul class="section-nav-list">
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#data-encoding-and-type-safety">Data encoding basics</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#specifying-coders">Specifying coders</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#default-coders-and-the-coderregistry">Default coders and the CoderRegistry</a></li>
      </ul>
    </li>
    <li class="section-nav-item--collapsible">
      <span class="section-nav-list-title">Windowing</span>

      <ul class="section-nav-list">
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#windowing">Windowing basics</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#provided-windowing-functions">Provided windowing functions</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#setting-your-pcollections-windowing-function">Setting your PCollection’s windowing function</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#watermarks-and-late-data">Watermarks and late data</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#adding-timestamps-to-a-pcollections-elements">Adding timestamps to a PCollection’s elements</a></li>
      </ul>
    </li>
    <li class="section-nav-item--collapsible">
      <span class="section-nav-list-title">Triggers</span>

      <ul class="section-nav-list">
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#triggers">Trigger basics</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#event-time-triggers">Event time triggers and the default trigger</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#processing-time-triggers">Processing time triggers</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#data-driven-triggers">Data-driven triggers</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#setting-a-trigger">Setting a trigger</a></li>
        <li><a href="{{ site.baseurl }}/documentation/programming-guide/#composite-triggers">Composite triggers</a></li>
      </ul>
    </li>
  </ul>
</li>
<li class="section-nav-item--collapsible">
  <span class="section-nav-list-title">Learning Resources</span>

  <ul class="section-nav-list">
    <li><a href="{{ site.baseurl }}/documentation/resources/learning-resources/#getting-started">Getting Started</a></li>
    <li><a href="{{ site.baseurl }}/documentation/resources/learning-resources/#articles">Articles</a></li>
    <li><a href="{{ site.baseurl }}/documentation/resources/learning-resources/#interactive-labs">Interactive Labs</a></li>
    <li><a href="{{ site.baseurl }}/documentation/resources/learning-resources/#code-examples">Code Examples</a></li>
    <li><a href="{{ site.baseurl }}/documentation/resources/learning-resources/#api-reference">API Reference</a></li>
    <li><a href="{{ site.baseurl }}/documentation/resources/learning-resources/#feedback-and-suggestions">Feedback and Suggestions</a></li>
    <li><a href="{{ site.baseurl }}/documentation/resources/learning-resources/#how-to-contribute">How to Contribute</a></li>
    <li><a href="{{ site.baseurl }}/documentation/resources/videos-and-podcasts">Videos and Podcasts</a></li>
  </ul>
</li>
<li><a href="https://cwiki.apache.org/confluence/display/BEAM/Apache+Beam">Beam Wiki</a></li>