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# Library structure

Before you can set about documenting patterns, you need to know where everything goes. The simplest folder structure looks like this:

    └── content
        ├── _index.md
        └── patterns
            ├── name-of-my-pattern.md
            └── name-of-my-other-pattern.md

- /content - This is where all of your content lives. You won’t need to visit any other folders very frequently.
- _index.md — This is the content for your home page.
- /patterns — This is the folder where individual pattern files are kept.

## Subsections

You may have noticed that this site’s navigation is divided partly into subsections, with labels like “Writing”. Infusion (or, rather, Hugo) allows you to create such subsections by simply nesting folders under the `/patterns` folder. In the following example, I have a subsection about different types of “popup” pattern.

    └── content
        ├── _index.md
        └── patterns
            ├── name-of-my-pattern.md
            ├── name-of-my-other-pattern.md
            └── popups
                ├── _index.md
                ├── popup-menu.md
                └── tooltip.md

Note that subfolders like `/popups` must each have an `_index.md` file. This file doesn’t need any content except the TOML metadata defining the title (name) of that subsection:

    +++
    title = "Popups"
    +++

The `/patterns` folder itself does not need indexing explicitly in this way.

Infusion does not currently support sub-subsections.

Now that you know where to put everything, it’s time to talk about how to actually write individual patterns. Don’t worry, it’s pretty straightforward. Turn to
Markdown & metadata.