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 Reveal system treated flowering plants as subdivision Magnoliophytina (Frohne & U. Jensen ex Reveal, Phytologia 79: 70 1996), but later split it to Magnoliopsida, Liliopsida, and Rosopsida.". Is that enough to answer the question?