Most philosophy classification schemes appear to begin with metaphysics, followed by epistemology, which is then followed by one or more branches that typically include logic, ethics and aesthetics.
Some schema also include a variety of what I loosely call "discipline philosophies" (is there a better term?), such as philosophy of science, philosophy of physics, philosophy of mathematics, philosophy of biology, philosophy of history, philosophy of education, philosophy of language, philosophy of law, philosophy of religion, philosophy of dance.
This is kind of a trivial question, but I wondered if these "disciplines of science" are given their own category as a matter of convenience, or if they simply don't fit in with the main established branches (metaphysics, epistemology, etc.
For example, most sciences can be loosely correlated with metaphysics, while the study of science focuses largely on epistemology (or more properly on the broader category philosophy of mind). Philosophy of law can similarly be thought of as the intersection of ethics, political philosophy and philosophy of mind.
To put it another way, imagine a classification scheme that includes metaphysics, philosophy of mind, logic, ethics and aesthetics. Would these branches combined intrinsically include these various "discipline philosophies"? Or is there something about philosophy of law, philosophy of dance, etc. that sets them apart from the primary branches?