It may seem unnecessary using an importer containing state for the task. However, by retaining some information about the already copied objects we can make sure that already imported objects don't get imported again.
Two types of indirect objects are never imported from one document to another: the catalog and page tree nodes. If the catalog was imported, the whole source document would be imported. And if one page tree node would imported, the whole page tree would be imported.
Public Class Methods
Initializes a new importer that can import objects to the
Public Instance Methods
Imports the given
object to the destination object and returns the imported object.
Note: Indirect objects are automatically added to the destination document but direct or simple objects are not.
source argument should be
nil or set to the source document of the imported object. If it is
nil, the source document is dynamically identified. If this identification is not possible and the source document would be needed, an error is raised.