I want to know the answer to the following question:
How does the APG system of 1998, with its 2003 and 2009 revisions, treat flowering plants?
All the background I'm provided with is that "The APG system of 1998, and the later 2003 and 2009 revisions, treat the flowering plants as a clade called angiosperms without a formal botanical name.". Is that enough to answer the question?
Answer: yes