Although these tags cannot be changed in general, they can be moved to a different location in the segment (while maintaining order and number of tags in the segment).

This form of layering does have its own drawbacks because its bakes in assumptions of location agnosticity and synchronicity of invocation into the higher order service units.

A symbolic link shows the location of the original file and requires a user to have access rights to the original file's location in order to use the link.