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+# The MyST implementation architecture
+
+This page describes implementation details to help you understand the structure
+of the project.
+
+## A Renderer for markdown-it tokens
+
+At a high level, the MyST parser is an extension of th project. Markdown-It-Py
+is a well-structured Python parser for CommonMark text. It also defines an extension
+point to include more syntax in parsed files. The MyST parser uses this extension
+point to define its own syntax options (e.g., for Sphinx roles and directives).
+
+The result of this parser is a markdown-it token stream.
+
+## A docutils renderer
+
+The MyST parser also defines a docutils renderer for the markdown-it token stream.
+This allows us to convert parsed elements of a MyST markdown file into docutils.
+
+## A Sphinx parser
+
+Finally, the MyST parser provides a parser for Sphinx, the documentation generation
+system. This parser does the following:
+
+* Parse markdown files with the markdown-it parser, including MyST specific plugins
+* Convert these files into docutils objects using the MyST docutils renderer
+* Provide these to Sphinx in order to use in building your site.