A hook that allows this processor to modify or enhance the given
document tree. A common use case is to add navigation information
for e-book formats like EPUB or PDF for example.
A hook that allows this processor to modify or enhance the given
document tree. A common use case is to add navigation information
for e-book formats like EPUB or PDF for example.
The modified tree produced by this method will be used for
rendering the interim format specified with the format property.