xmlns:atom="http://www.w3.org/2005/Atom"
Testun rhagarweiniol
1.Enwi a dehongli
2.Y darpariaethau a ddaw i rym ar 1 Hydref 1999
3.Y darpariaethau a ddaw i rym ar 1 Ebrill 2000
Llofnod
Nodyn Esboniadol