if you ever loaded a .sub file (subset) in an editor this is the format you would expect:

Dynamic slices can be quite useful when the elements you display in your reports evolve over time, they automatically update with the new elements.
The following article will try to dig into the parameters that define these slices and show some of the possibilities to interact with these. The idea was originally submitted by Philip Bichard.

The dynamic slice parameters stored in the names list of the worksheet
to display these in Excel: insert -> name -> paste -> paste list

Maintaining subsets on your server might be problematic. For example you wanted to delete an old subset that you found out to be incorrect and your server replied this:

This is not quite helpful, as it does not say which views are affected and need to be corrected.