There are different types of places teachers practice. Teachers work in public and private schools, and also in state and private colleges. Judgment is the fourth characteristic Shulman presents to us. Teachers need to have very good judgment, because of the many decisions they face. The fifth characteristic is Learning from Experience.
Teachers definitely learn from experience.
First of all they go through school seeing how teachers work. Then in college they have observing and student teaching to go through. The last characteristic Shulman has in the article is Community. Teachers in a school are all in a community because they all are teaching their class for the same thing, which is to teach the students knowledge they will need to posses to further their education. These six characteristics should be more than enough information to convince you that teaching is a profession.