You may notice your XDP files are bloating in size when you are working with Designer ES 8.2.1. A simple XDP file of 100kb could easily bloat up to 5MB.
The StyleId processing instruction “<?templateDesigner StyleID aped3?>” is being duplicated many times in the XDP source.
This issue is fixed in Designer 8.2.1 SP2, and in Designer 9. You can delete these duplicate processing instructions in the XML Source for your existing XDP files.