How attribute set defaults work
Each attribute set contains certain attributes by default. To see the defaults for an attribute set, open any of the attribute set files in the DITA-OT/plugins/org.dita.pdf2/cfg/fo/attrs/ folder. The attributes you see there are the defaults.
When you copy an attribute set file to your plugin and change the attribute sets in it, you can change the value of one or more attributes or add attributes, but you cannot delete any of the default attributes. If you do, the results will not be what you expect.
Here’s why. When you create your plugin, you probably won’t customize every single aspect of org.dita.pdf2. Therefore, ...