Different steering documents regulates different activities.
The Education Act, adopted by the Riksdag, regulates compulsory schools and other school forms. Special programmes and special needs schools are separate school forms with their own curriculums.
An ordinance contains regulations and is adopted by the Government. There are a number of ordinances e.g. the School Ordinance, and the Ordinance on the Child's and Pupil's Participation in the Work of Establishing a Plan for Equal Treatment.
All curriculums are also ordinances. In the curriculums you can read about the fundamental goals and guidelines for the school. School forms such as special programmes and special needs schools have their own curriculums.