The handlebar template that use Context as input, and generate the HTML as the content of the Widget. The Template is the presentation of the Widget, not the data of the Widget.
The schema of the simple editor of the Widget. The schema can change the layout of simple editor. For example, if we declare an object is type of “photo” in the schema, then that object in simple editor will be presented as a photo selector/uploader logic, instead of just a text input.