swish-0.3.2.1: A semantic web toolkit.

PortabilityFlexibleInstances, UndecidableInstances
Stabilityexperimental
MaintainerDouglas Burke

Swish.RDF.RDFProof

Description

This module instantiates the Proof framework for constructing proofs over RDFGraph expressions. The intent is that this can be used to test some correspondences between the RDF Model theory and corresponding proof theory based on closure rules applied to the graph, per http://www.w3.org/TR/rdf-mt/.

Synopsis

Documentation

makeRDFProofSource

Arguments

:: [RDFRuleset]

RDF rulesets that constitute a proof context for this proof

-> RDFFormula

initial statement from which the goal is claimed to be proven

-> RDFFormula

statement that is claimed to be proven

-> [RDFProofStep] 
-> RDFProof 

Make an RDF proof

makeRDFProofStepSource

Arguments

:: RDFRule

rule to use for this step

-> [RDFFormula]

antecedent RDF formulae for this step

-> RDFFormula

RDF formula that is the consequent for this step

-> RDFProofStep 

Make an RDF graph proof step

makeRdfInstanceEntailmentRuleSource

Arguments

:: ScopedName

name

-> [RDFLabel]

vocabulary

-> RDFRule 

Make an inference rule dealing with RDF instance entailment; i.e. entailments that are due to replacement of a URI or literal node with a blank node.

The part of this rule expected to be useful is checkInference. The fwdApply and bwdApply functions defined here may return rather large results if applied to graphs with many variables or a large vocabulary, and are defined for experimentation.

Forward and backward chaining is performed with respect to a specified vocabulary. In the case of backward chaining, it would otherwise be impossible to bound the options thus generated. In the case of forward chaining, it is often not desirable to have the properties generalized. If forward or backward backward chaining will not be used, supply an empty vocabulary. Note: graph method allNodes can be used to obtain a list of all the subjects and objuects used ina graph, not counting nested formulae; use a call of the form:

  allNodes (not . labelIsVar) graph

makeRdfSubgraphEntailmentRule :: ScopedName -> RDFRuleSource

Make an inference rule dealing with RDF subgraph entailment. The part of this rule expected to be useful is checkInference. The fwdApply function defined here may return rather large results. But in the name of completeness and experimentation with the possibilities of lazy evaluation, it has been defined.

Backward chaining is not performed, as there is no reasonable way to choose a meaningful supergraph of that supplied.

makeRdfSimpleEntailmentRule :: ScopedName -> RDFRuleSource

Make an inference rule dealing with RDF simple entailment. The part of this rule expected to be useful is checkInference. The fwdApply and bwdApply functions defined return null results, indicating that they are not useful for the purposes of proof discovery.