1. A method of processing non-transitory stored binary digital signal quantities using a computing device comprising: transforming via said computing device between at least first and at least second non-transitory stored binary digital signal quantities respectively representing at least a first and at least a second expression, said represented expressions having a common view for non-common expression types of said represented expressions and having a non-common view for common expression types of said represented expressions, said represented expressions comprising at least one of the following expression types: a hierarchical edge and/or node labeled tree or a symbol string.