Syntax ¹

Note the following:

• You can have multiple hosts.
• Hosts are always rendered in the front of the system.
• Orbitals are rendered in the order as they are defined.
• Satellites will be attached to the last orbital defined. Intendations are optional but recommended for readability.

system: [title_def] (host_def | orbital_def | sattelite_def)*

title_def: "T" LABEL

host_def: "H" host_class host_size
host_class: /[OBAFGKM]/
host_size: NUM

orbital_def: "O" orbital_type orbital_size
| "O" orbital_type orbital_size orbital_label
| "O" orbital_type orbital_size "[" orbital_rings "]"
| "O" orbital_type orbital_size orbital_label "[" orbital_rings "]"
orbital_rings:  "rings=" NUM
orbital_type:   /Pl|As|Ex/
orbital_size:   NUM
orbital_label:  LABEL

sattelite_def: "S" sattelite_type sattelite_size [sattelite_label]
sattelite_type: /Mn|St/
sattelite_size: NUM
sattelite_label: LABEL

NUM: /[0-9]+/
LABEL: /"[^"]+"/

1. Provided as EBNF