A memory device includes isolation trenches that are formed generally parallel to and along associated strips of active area. The process further includes hydrocracking the hydrotreated coal tar stream to further hydrogenate the aromatic compounds and to crack at least one ring of multi-ring aromatic compounds to form single-ring aromatic compounds. For example, certain \u201cextension language\u201d data cartridges can be provided that enable an event processing system to support complex data types and associated methodsoperations that are common in object-oriented languages, but are not common in event processing languages. A sacrificial film is formed to fill the via hole.