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<article class="md-content__inner md-typeset">
<h1>Serialization</h1>
<h2 id="introduction">Introduction</h2>
<p>A <em>document serializer</em> (AKA simply <em>serializer</em>) is a Docling abstraction that is
initialized with a given <a href="../docling_document/"><code>DoclingDocument</code></a> and returns a
textual representation for that document.</p>
<p>Besides the document serializer, Docling defines similar abstractions for several
document subcomponents, for example: <em>text serializer</em>, <em>table serializer</em>,
<em>picture serializer</em>, <em>list serializer</em>, <em>inline serializer</em>, and more.</p>
<p>Last but not least, a <em>serializer provider</em> is a wrapper that abstracts the
document serialization strategy from the document instance.</p>
<h2 id="base-classes">Base classes</h2>
<p>To enable both flexibility for downstream applications and out-of-the-box utility,
Docling defines a serialization class hierarchy, providing:</p>
<ul>
<li>base types for the above abstractions: <code>BaseDocSerializer</code>, as well as
<code>BaseTextSerializer</code>, <code>BaseTableSerializer</code> etc, and <code>BaseSerializerProvider</code>, and</li>
<li>specific subclasses for the above-mentioned base types, e.g. <code>MarkdownDocSerializer</code>.</li>
</ul>
<p>You can review all methods required to define the above base classes <a href="https://github.com/docling-project/docling-core/blob/main/docling_core/transforms/serializer/base.py">here</a>.</p>
<p>From a client perspective, the most relevant is <code>BaseDocSerializer.serialize()</code>, which
returns the textual representation, as well as relevant metadata on which document
components contributed to that serialization.</p>
<h2 id="use-in-doclingdocument-export-methods">Use in <code>DoclingDocument</code> export methods</h2>
<p>Docling provides predefined serializers for Markdown, HTML, and DocTags.</p>
<p>The respective <code>DoclingDocument</code> export methods (e.g. <code>export_to_markdown()</code>) are
provided as user shorthands — internally directly instantiating and delegating to
respective serializers.</p>
<h2 id="examples">Examples</h2>
<p>For an example showcasing how to use serializers, see
<a href="../../examples/serialization/">here</a>.</p>
</article>
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