A process for making perforations in a plastic film material to be used in a package for products prone to decay, in which the surface area of the perforations made in a defined surface area of the plastic film material must have a predetermined value, which process has the following steps: A. A schema matching system generates a mapping between an interface schema and a result schema of a web database, which is used to represent the underlying database schema. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. In some embodiments, the polishing element may be comprised of a plurality of individual polishing members. The instruction decoder then identifies at least one source location within the digital storage device based on the source information of the corresponding instruction. The combiner includes birefringent elements, that are linearly or rotationally displaced to realize the composite beam.