MyCSS_VALUES_COLOR_ID_MEDIUMSLATEBLUE

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
enum MyCSS_VALUES_COLOR_ID_MEDIUMSLATEBLUE = mycss_values_color_id.MyCSS_VALUES_COLOR_ID_MEDIUMSLATEBLUE;

Meta