seems to provide a good intuition of the meaning attached to comp(P) by the
procedure. However, the difficulties we have seen of finding a semantics wit
which SLDNF-resolution is sound and complete for general programs lends
support to John Lloyd's view that a more profitable line of research is to try
and extend the class of hierarchical programs and suitably allowed queries for
which SLDNF-resolution is complete wit the class of 2-valued consequences of
comp(P). But in pursuing this aim a closer semantic approximation to SLDNF-
resolution in the general case might be a useful tool as well as providing more
insight into the logica ...
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