Furthermore, editing the XSLT is made even easier by the fact that Screenbook Maker works in conjuction with a breakthrough programming tool called Leo. Leo is a Literate Programming Editor that allows you to view the XSLT code in an easy-to-read outline form. You can quickly find the parts you want to edit and ignore the rest of the code.

Not only does Leo allow you to view the code of an individual file in outline form, it also can contain numerous files inside of one outline. All of the default XSLT files that come with Screenbook Maker are contained in one single Leo file, and can be viewed and edited within Leo.