a doubt on basic concepts

Dear all,
       as i read, some basic ideas i would like to enquire.
DAML
DAML + OIL
OIL
RDF.

well,  DAML has two version, (or we say DAML actually is DAML family?
)one is DAML-ONT (old) , the other is DAML-OIL(new). correct?

OIL, a kind of ontology presentation language. and DAML-OIL is its RDF
version of syntax serialization., correct?

thanks for enligthen.

urs
Peter