Allows you to replace block references of one name with another. This is especially useful when a block's attributes properties have changed -- tag string, attribute order, number of attributes, etc. Changes to a block's definition do not affect the attributes of existing block references. Therefore, redefining a block's definition does not update these references. Block Replace not only updates them, but also allows you to transfer the attribute values from the old block reference to the new one using a variety of convenient methods. Several options are available to provide the maximum flexibility for you. You need not lose another attribute value.