18.3 Using a new format

New formats should be stored within a package and installed onto your local system. This allows the format to be provided to the document YAML. Assuming our example format quarterly_report is in a package named mypackage, we can use it as follows:

title: "Habits"
    toc: true

This means to use the quarterly_report() function defined in mypackage as the output format, and to pass toc = TRUE as a parameter to the function.