2. The method of claim 1 , wherein each of said plurality of referenced tags is represented by a unique identifier in said memory.
2. The method of claim 1 , wherein each of said plurality of referenced tags is represented by a unique identifier in said memory. 3. The method of claim 2 , further comprising, in said pre-processing, changing any relative paths of any of said plurality of referenced tags in said set of transformation rules to corresponding unique identifiers and storing a resulting changed set of transformation rules in another memory, wherein the unique identifiers and said changed set of transformation rules are used in processing each of the retrieved source tags.