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+########
+Overview
+########
+
+.. default-domain:: c
+.. highlight:: c
+
+The API revolves around two main types: the :doc:`api/reader`,
+which reads text and fires callbacks,
+and the :doc:`api/writer`,
+which writes text when driven by corresponding functions.
+Both work in a streaming fashion but still support pretty-printing,
+so the pair can be used to pretty-print, translate,
+or otherwise process arbitrarily large documents very quickly.
+The context of a stream is tracked by the :doc:`api/env`,
+which stores the current base URI and set of namespace prefixes.
+
+The complete API is declared in ``serd.h``:
+
+.. code-block:: c
+
+   #include <serd/serd.h>