def init
            catalog = (self.Catalog = (trailer_key(:Root) || Catalog.new))
            @revisions.last.trailer.Root = catalog.reference

            loaded!

            self
        end
def init
            catalog = (self.Catalog = (trailer_key(:Root) || Catalog.new))
            @revisions.last.trailer.Root = catalog.reference

            loaded!

            self
        end
Instanciates basic structures required for a valid PDF file.