73. Apparatus according to claim 64, further including means for assigning a hierarchical level to the assigned first name.
74. Apparatus according to claim 73, further including means for assigning a plurality of additional names to be associated with a respective plurality of sets of data presentation characteristics; means for associating at least one of said plurality of additional names with at least a portion of said range; means for assigning a hierarchical level to said at least one of said additional names, which is higher than the level assigned to the first name; means for presenting both the characteristics associated with said first name and said at least one additional name as long as the characteristics of the first name are not overlaid by a contradictory specifications of the said at least one additional name; and means for superseding the characteristics associated with the lower level by the characteristics associated with the higher level if the characteristics are contradictory.