<\body> The graphical primitives are still under heavy development and will be documented later. <\explain> <|explain> Please document. <\explain> >|content-n> <|explain> Please document. <\explain> >|gr-content-n> <|explain> Please document. <\explain> <|explain> Please document. <\explain> >|coord-n> <|explain> Please document. <\explain> >|point-n> <|explain> Please document. <\explain> >|point-n> <|explain> Please document. <\explain> >|point-n> <|explain> Please document. <\explain> >|point-n> <|explain> Please document. <\explain> >|point-n> <|explain> Please document. <\explain> <|explain> Please document.