From Elite Wiki

Use this template (like this: {{Ship-OXP}}) on pages about OXPs that add ships to automatically put them in the correct categories.

Do not use this template on pages about each individual ship in an OXP, only on a page about the OXP itself. (For OXPs with only one ship in, it’s appropriate for a single page to describe both the ship and the OXP as a whole.) For pages about a ship, use Template:Infobox ShipStats Oolite.

Ships OXPs are listed at Category:Ships OXPs.