Naming Conventions

All Xlib routine names begin with an uppercase X and the remainder of the name follows a mixed case convention, where the first letter of each word is in uppercase, for example XOpenDisplay. Nearly all Xlib macro names and predefined constants do not begin with an uppercase X, but follow the mixed case convention, for example the macro WhitePixel. The predefined constants referring to predefined atom names use all uppercase letters, with underscores between words and begin with XA_, for example XA_WM_HINTS. Most Xlib data structure type names begin with an uppercase X and follow the mixed case convention, for example XEvent. The names of the components of Xlib data structures use lowercase letters, with underscores between words, for example do_not_propagate_mask.