Link - RDF API for PHP ( RAP )

Updated Sept 24 2008: added features and SWCL link

The RAP project ( that is RDF API for PHP ) has a type of inference engine based on the RAP InfModel class. This implements both forward and backward chaining through a network of relationship as eressed by RDF triples. Some OWL entailments are also implemented. It has rule engine features but is not really a rule engine - can it be extended from relationships to conditions/actions ?

List of features and links from the RAP site: