What are the salient provisions of the Philippine National Language Policy according to the 1987 Constitution?

1. That the Philippines has a national language (section 6, sentence 1).
2. That this national language shall be known as Filipino (section 6, sentence 1).
3. That this language shall be developed and enriched on the basis of existing Philippine and other languages (section 6, sentence 2).
4. That this language is the medium of official communication (section 7, sentence 1).
5. That this language is the medium of instruction (section 7, sentence 1).
6. That the government may remove English as an official language (section 7, sentence 1).
7. That the regional languages are auxiliary official languages in the region (section 7, sentence 2).
8. That the regional languages are auxiliary media of instruction in the region (section 7, sentence 2).
9. That the government has an obligation to promote Spanish on a voluntary and optional basis.
10. That the government has an obligation to promote Arabic on a voluntary and optional basis.
11. That the government has an obligation to establish "a national language commission" to "undertake, coordinate, and promote researches for the development, propagation, and preservation of Filipino and other languages."