API

The atomic universe contains numerous data frames of potentially related information (the three types of DataFrames used are inherited from exa's base data frame classes, see exa-analytics/exa Wiki). Here is a layout of how this new organizational structure applies to the atomic package:

Concept	utility	class	type	index	foreign keys	attributes
frame	public	Frame	DataFrame	frame	-	atom_count
atom	public	Atom	DataFrame	atom	frame	x, y, z, symbol, label
unitatom	private	UnitAtom	Updater	atom	-	x, y, z
superatom	private	SuperAtom	DataFrame	satom	frame, atom	x, y, z, symbol
vizatom	private	VizAtom	Updater	atom	-	x, y, z
two	public	TwoBody	DataFrame	two	frame	distance, bond, symbols
supertwo	private	SuperTwo	DataFrame	stwo	frame	distance, bond, symbols
atomtwo	private	AtomTwo	ManyToMany	-	atom, two	-
satomstwo	private	SAtomSTwo	ManyToMany	-	satom, stwo	-
orbital	public	Orbital	DataFrame	orbital	frame	occupation, energy

What about:

Concept	utility	class	type	index	foreign keys	attributes
frame	public	Frame	DataFrame	frame	-	atom_count
atom	public	Atom	DataFrame	atom	frame	x, y, z, symbol, label
unit_atom	private	UnitAtom	Updater	atom	-	x, y, z
prj_atom	private	ProjectedAtom	DataFrame	prjatom	frame, atom	x, y, z, symbol
viz_atom	private	VizAtom	Updater	atom	-	x, y, z
two	public	TwoBody	DataFrame	two	frame	distance, bond, symbols
prj_two	private	ProjectedTwo	DataFrame	prjtwo	frame	distance, bond, symbols
atomtwo	private	AtomTwo	ManyToMany	-	atom, two	-
prjatomtwo	private	SuperAtomTwo	ManyToMany	-	prjat, prjtwo	-
orbital	public	Orbital	DataFrame	orbital	frame	occupation, energy
molecule	public	Molecule	DataFrame	molecule	frame	cx, cy, cz, mass, simple
prj_molecule	public	ProjectedMolecule	DataFrame	molecule	frame	cx, cy, cz, mass, simple