Custom structure


 * The root tag
 * The type of structure feature. Must be one of the types listed below.
 * The settings for this structure feature. The settings vary depending on . Any name not listed under this tag has no settings; however, they must still include an empty   object in their definition.
 * If  is ,  , or  :
 * The namespaced id of the structure pool to start from.
 * Must be between 0 and 7, inclusive.
 * If  is  :
 * Must be either  or.
 * Decimal probability between 0 and 1.
 * If  is  :
 * Must be one of,  ,  ,  ,  ,  , or.
 * If  is  :
 * (optional): Whether or not the shipwreck is beached. Defaults to false if not provided.
 * If  is  :
 * Must be either  or.
 * Decimal probability between 0 and 1.
 * Decimal probability between 0 and 1.
 * If  is  :
 * Decimal probability between 0 and 1.