The name of this package stands for “Custom COntent Oriented for LaTeX”, a concept pioneered by the 2005 cool package. This is done using a minimalist interface built upon xparse. Specifically, \Ccool<name> begins a series of instructions alternating between ‘text’ and macro definitions, that themselves optionally expand using predefined or inline rules. In conjunction with lamba expressions, this tool allows for encoding the way certain mathematical objects, such as functions, should be formatted. Optionally, the macros can be written to a file, and read, which can be useful for typesetting documents sharing the same notation.