Negation and Disjunction in RIF

Hello everyone,
 
I am a newcomer to this field and trying to learn. The question I have is w.r.t. support for negation (specifically NAF: negation as failure) and disjunction in RIF. As far as I know, SWRL natively does not support them. Is this true for RIF as well? 
 
Thank you,
- Jyoti