Various example embodiments are disclosed. According to an example embodiment, a computer-implemented method may include receiving user interface guidelines via an editor graphical user interface, generating extensible-markup language (XML) guideline data based on the received user interface guidelines, presenting a prototyping graphical user interface with user interface element options based on the XML guideline data, receiving prototype user interface element settings via the prototyping graphical user interface, and generating XML prototype data based on the prototype user interface element settings.