in my case I need 3 layouts for my posts
- first for the html page
- second some simplified html for my rss feed (in my case `contentWithoutLayouts` will not do the job).
- third for content as json.

using layouts
- `layouts/posts/default.html.eco`
- `layouts/posts/simple.html.eco`
- `layouts/posts/data.json.eco`

for my post `documents/blog/post1.html.md'
will result in
- `blog/post1.html`
- `blog/post1-simple.html`
- `blog/post1-data.json`

In my case it was clearer. Maybe not the better solution for everyone.