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<h1>Source code for rdflib.plugins.parsers.pyRdfa.rdfs.process</h1><div class="highlight"><pre>
<span class="c"># -*- coding: utf-8 -*-</span>
<span class="sd">"""</span>
<span class="sd">@organization: U{World Wide Web Consortium<http://www.w3.org>}</span>
<span class="sd">@author: U{Ivan Herman<a href="http://www.w3.org/People/Ivan/">}</span>
<span class="sd">@license: This software is available for use under the</span>
<span class="sd">U{W3C® SOFTWARE NOTICE AND LICENSE<href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">}</span>
<span class="sd">"""</span>
<span class="sd">"""</span>
<span class="sd">$Id: process.py,v 1.7 2012-03-23 14:06:38 ivan Exp $ $Date: 2012-03-23 14:06:38 $</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">rdflib</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">URIRef</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">Literal</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">BNode</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">Namespace</span>
<span class="k">if</span> <span class="n">rdflib</span><span class="o">.</span><span class="n">__version__</span> <span class="o">>=</span> <span class="s">"3.0.0"</span> <span class="p">:</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">RDF</span> <span class="k">as</span> <span class="n">ns_rdf</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">RDFS</span> <span class="k">as</span> <span class="n">ns_rdfs</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">Graph</span>
<span class="k">else</span> <span class="p">:</span>
<span class="kn">from</span> <span class="nn">rdflib.RDFS</span> <span class="kn">import</span> <span class="n">RDFSNS</span> <span class="k">as</span> <span class="n">ns_rdfs</span>
<span class="kn">from</span> <span class="nn">rdflib.RDF</span> <span class="kn">import</span> <span class="n">RDFNS</span> <span class="k">as</span> <span class="n">ns_rdf</span>
<span class="kn">from</span> <span class="nn">rdflib.Graph</span> <span class="kn">import</span> <span class="n">Graph</span>
<span class="n">ns_owl</span> <span class="o">=</span> <span class="n">Namespace</span><span class="p">(</span><span class="s">"http://www.w3.org/2002/07/owl#"</span><span class="p">)</span>
<span class="kn">from</span> <span class="nn">..host</span> <span class="kn">import</span> <span class="n">MediaTypes</span>
<span class="kn">from</span> <span class="nn">..utils</span> <span class="kn">import</span> <span class="n">URIOpener</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">err_outdated_cache</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">err_unreachable_vocab</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">err_unparsable_Turtle_vocab</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">err_unparsable_xml_vocab</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">err_unparsable_ntriples_vocab</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">err_unparsable_rdfa_vocab</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">err_unrecognised_vocab_type</span>
<span class="kn">from</span> <span class="nn">..</span> <span class="kn">import</span> <span class="n">VocabReferenceError</span>
<span class="kn">from</span> <span class="nn">.cache</span> <span class="kn">import</span> <span class="n">CachedVocab</span>
<span class="kn">from</span> <span class="nn">..</span> <span class="kn">import</span> <span class="n">HTTPError</span><span class="p">,</span> <span class="n">RDFaError</span>
<span class="c">#############################################################################################################</span>
<div class="viewcode-block" id="return_graph"><a class="viewcode-back" href="../../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.rdfs.html#rdflib.plugins.parsers.pyRdfa.rdfs.process.return_graph">[docs]</a><span class="k">def</span> <span class="nf">return_graph</span><span class="p">(</span><span class="n">uri</span><span class="p">,</span> <span class="n">options</span><span class="p">,</span> <span class="n">newCache</span> <span class="o">=</span> <span class="bp">False</span><span class="p">)</span> <span class="p">:</span>
<span class="sd">"""Parse a file, and return an RDFLib Graph. The URI's content type is checked and either one of</span>
<span class="sd"> RDFLib's parsers is invoked (for the Turtle, RDF/XML, and N Triple cases) or a separate RDFa processing is invoked</span>
<span class="sd"> on the RDFa content.</span>
<span class="sd"> </span>
<span class="sd"> The Accept header of the HTTP request gives a preference to Turtle, followed by RDF/XML and then HTML (RDFa), in case content negotiation is used.</span>
<span class="sd"> </span>
<span class="sd"> This function is used to retreive the vocabulary file and turn it into an RDFLib graph.</span>
<span class="sd"> </span>
<span class="sd"> @param uri: URI for the graph</span>
<span class="sd"> @param options: used as a place where warnings can be sent</span>
<span class="sd"> @param newCache: in case this is used with caching, whether a new cache is generated; that modifies the warning text</span>
<span class="sd"> @return: A tuple consisting of an RDFLib Graph instance and an expiration date); None if the dereferencing or the parsing was unsuccessful</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">return_to_cache</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span> <span class="p">:</span>
<span class="k">if</span> <span class="n">newCache</span> <span class="p">:</span>
<span class="n">options</span><span class="o">.</span><span class="n">add_warning</span><span class="p">(</span><span class="n">err_unreachable_vocab</span> <span class="o">%</span> <span class="n">uri</span><span class="p">,</span> <span class="n">warning_type</span><span class="o">=</span><span class="n">VocabReferenceError</span><span class="p">)</span>
<span class="k">else</span> <span class="p">:</span>
<span class="n">options</span><span class="o">.</span><span class="n">add_warning</span><span class="p">(</span><span class="n">err_outdated_cache</span> <span class="o">%</span> <span class="n">uri</span><span class="p">,</span> <span class="n">warning_type</span><span class="o">=</span><span class="n">VocabReferenceError</span><span class="p">)</span>
<span class="n">retval</span> <span class="o">=</span> <span class="bp">None</span>
<span class="n">expiration_date</span> <span class="o">=</span> <span class="bp">None</span>
<span class="n">content</span> <span class="o">=</span> <span class="bp">None</span>
<span class="k">try</span> <span class="p">:</span>
<span class="n">content</span> <span class="o">=</span> <span class="n">URIOpener</span><span class="p">(</span><span class="n">uri</span><span class="p">,</span>
<span class="p">{</span><span class="s">'Accept'</span> <span class="p">:</span> <span class="s">'text/html;q=0.8, application/xhtml+xml;q=0.8, text/turtle;q=1.0, application/rdf+xml;q=0.9'</span><span class="p">})</span>
<span class="k">except</span> <span class="n">HTTPError</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">return_to_cache</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="p">(</span><span class="bp">None</span><span class="p">,</span><span class="bp">None</span><span class="p">)</span>
<span class="k">except</span> <span class="n">RDFaError</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">return_to_cache</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="p">(</span><span class="bp">None</span><span class="p">,</span><span class="bp">None</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">return_to_cache</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="p">(</span><span class="bp">None</span><span class="p">,</span><span class="bp">None</span><span class="p">)</span>
<span class="c"># Store the expiration date of the newly accessed data</span>
<span class="n">expiration_date</span> <span class="o">=</span> <span class="n">content</span><span class="o">.</span><span class="n">expiration_date</span>
<span class="k">if</span> <span class="n">content</span><span class="o">.</span><span class="n">content_type</span> <span class="o">==</span> <span class="n">MediaTypes</span><span class="o">.</span><span class="n">turtle</span> <span class="p">:</span>
<span class="k">try</span> <span class="p">:</span>
<span class="n">retval</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">()</span>
<span class="n">retval</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">content</span><span class="o">.</span><span class="n">data</span><span class="p">,</span> <span class="n">format</span><span class="o">=</span><span class="s">"n3"</span><span class="p">)</span>
<span class="k">except</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">options</span><span class="o">.</span><span class="n">add_warning</span><span class="p">(</span><span class="n">err_unparsable_Turtle_vocab</span> <span class="o">%</span> <span class="p">(</span><span class="n">uri</span><span class="p">,</span><span class="n">value</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">content</span><span class="o">.</span><span class="n">content_type</span> <span class="o">==</span> <span class="n">MediaTypes</span><span class="o">.</span><span class="n">rdfxml</span> <span class="p">:</span>
<span class="k">try</span> <span class="p">:</span>
<span class="n">retval</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">()</span>
<span class="n">retval</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">content</span><span class="o">.</span><span class="n">data</span><span class="p">)</span>
<span class="k">except</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">options</span><span class="o">.</span><span class="n">add_warning</span><span class="p">(</span><span class="n">err_unparsable_Turtle_vocab</span> <span class="o">%</span> <span class="p">(</span><span class="n">uri</span><span class="p">,</span><span class="n">value</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">content</span><span class="o">.</span><span class="n">content_type</span> <span class="o">==</span> <span class="n">MediaTypes</span><span class="o">.</span><span class="n">nt</span> <span class="p">:</span>
<span class="k">try</span> <span class="p">:</span>
<span class="n">retval</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">()</span>
<span class="n">retval</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">content</span><span class="o">.</span><span class="n">data</span><span class="p">,</span> <span class="n">format</span><span class="o">=</span><span class="s">"nt"</span><span class="p">)</span>
<span class="k">except</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">options</span><span class="o">.</span><span class="n">add_warning</span><span class="p">(</span><span class="n">err_unparsable_ntriples_vocab</span> <span class="o">%</span> <span class="p">(</span><span class="n">uri</span><span class="p">,</span><span class="n">value</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">content</span><span class="o">.</span><span class="n">content_type</span> <span class="ow">in</span> <span class="p">[</span><span class="n">MediaTypes</span><span class="o">.</span><span class="n">xhtml</span><span class="p">,</span> <span class="n">MediaTypes</span><span class="o">.</span><span class="n">html</span><span class="p">,</span> <span class="n">MediaTypes</span><span class="o">.</span><span class="n">xml</span><span class="p">]</span> <span class="ow">or</span> <span class="n">xml_application_media_type</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">content</span><span class="o">.</span><span class="n">content_type</span><span class="p">)</span> <span class="o">!=</span> <span class="bp">None</span> <span class="p">:</span>
<span class="k">try</span> <span class="p">:</span>
<span class="kn">from</span> <span class="nn">pyRdfa</span> <span class="kn">import</span> <span class="n">pyRdfa</span>
<span class="kn">from</span> <span class="nn">pyRdfa.options</span> <span class="kn">import</span> <span class="n">Options</span>
<span class="n">options</span> <span class="o">=</span> <span class="n">Options</span><span class="p">()</span>
<span class="n">retval</span> <span class="o">=</span> <span class="n">pyRdfa</span><span class="p">(</span><span class="n">options</span><span class="p">)</span><span class="o">.</span><span class="n">graph_from_source</span><span class="p">(</span><span class="n">content</span><span class="o">.</span><span class="n">data</span><span class="p">)</span>
<span class="k">except</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">options</span><span class="o">.</span><span class="n">add_warning</span><span class="p">(</span><span class="n">err_unparsable_rdfa_vocab</span> <span class="o">%</span> <span class="p">(</span><span class="n">uri</span><span class="p">,</span><span class="n">value</span><span class="p">))</span>
<span class="k">else</span> <span class="p">:</span>
<span class="n">options</span><span class="o">.</span><span class="n">add_warning</span><span class="p">(</span><span class="n">err_unrecognised_vocab_type</span> <span class="o">%</span> <span class="p">(</span><span class="n">uri</span><span class="p">,</span> <span class="n">content</span><span class="o">.</span><span class="n">content_type</span><span class="p">))</span>
<span class="k">return</span> <span class="p">(</span><span class="n">retval</span><span class="p">,</span> <span class="n">expiration_date</span><span class="p">)</span>
<span class="c">############################################################################################</span></div>
<span class="nb">type</span> <span class="o">=</span> <span class="n">ns_rdf</span><span class="p">[</span><span class="s">"type"</span><span class="p">]</span>
<span class="n">Property</span> <span class="o">=</span> <span class="n">ns_rdf</span><span class="p">[</span><span class="s">"Property"</span><span class="p">]</span>
<span class="n">Class</span> <span class="o">=</span> <span class="n">ns_rdfs</span><span class="p">[</span><span class="s">"Class"</span><span class="p">]</span>
<span class="n">subClassOf</span> <span class="o">=</span> <span class="n">ns_rdfs</span><span class="p">[</span><span class="s">"subClassOf"</span><span class="p">]</span>
<span class="n">subPropertyOf</span> <span class="o">=</span> <span class="n">ns_rdfs</span><span class="p">[</span><span class="s">"subPropertyOf"</span><span class="p">]</span>
<span class="n">equivalentProperty</span> <span class="o">=</span> <span class="n">ns_owl</span><span class="p">[</span><span class="s">"equivalentProperty"</span><span class="p">]</span>
<span class="n">equivalentClass</span> <span class="o">=</span> <span class="n">ns_owl</span><span class="p">[</span><span class="s">"equivalentClass"</span><span class="p">]</span>
<div class="viewcode-block" id="MiniOWL"><a class="viewcode-back" href="../../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.rdfs.html#rdflib.plugins.parsers.pyRdfa.rdfs.process.MiniOWL">[docs]</a><span class="k">class</span> <span class="nc">MiniOWL</span> <span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Class implementing the simple OWL RL Reasoning required by RDFa in managing vocabulary files. This is done via</span>
<span class="sd"> a forward chaining process (in the L{closure} method) using a few simple rules as defined by the RDF and the OWL Semantics</span>
<span class="sd"> specifications.</span>
<span class="sd"> </span>
<span class="sd"> @ivar graph: the graph that has to be expanded</span>
<span class="sd"> @ivar added_triples: each cycle collects the triples that are to be added to the graph eventually.</span>
<span class="sd"> @type added_triples: a set, to ensure the unicity of triples being added</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="MiniOWL.__init__"><a class="viewcode-back" href="../../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.rdfs.html#rdflib.plugins.parsers.pyRdfa.rdfs.process.MiniOWL.__init__">[docs]</a> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">graph</span><span class="p">,</span> <span class="n">schema_semantics</span> <span class="o">=</span> <span class="bp">False</span><span class="p">)</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">graph</span> <span class="o">=</span> <span class="n">graph</span>
<span class="bp">self</span><span class="o">.</span><span class="n">added_triples</span> <span class="o">=</span> <span class="bp">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">schema_semantics</span> <span class="o">=</span> <span class="n">schema_semantics</span>
</div>
<div class="viewcode-block" id="MiniOWL.closure"><a class="viewcode-back" href="../../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.rdfs.html#rdflib.plugins.parsers.pyRdfa.rdfs.process.MiniOWL.closure">[docs]</a> <span class="k">def</span> <span class="nf">closure</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Generate the closure the graph. This is the real 'core'.</span>
<span class="sd"> The processing rules store new triples via the L{separate method<store_triple>} which stores</span>
<span class="sd"> them in the L{added_triples<added_triples>} array. If that array is emtpy at the end of a cycle,</span>
<span class="sd"> it means that the whole process can be stopped.</span>
<span class="sd"> """</span>
<span class="c"># Go cyclically through all rules until no change happens</span>
<span class="n">new_cycle</span> <span class="o">=</span> <span class="bp">True</span>
<span class="n">cycle_num</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">while</span> <span class="n">new_cycle</span> <span class="p">:</span>
<span class="c"># yes, there was a change, let us go again</span>
<span class="n">cycle_num</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="c"># go through all rules, and collect the replies (to see whether any change has been done)</span>
<span class="c"># the new triples to be added are collected separately not to interfere with</span>
<span class="c"># the current graph yet</span>
<span class="bp">self</span><span class="o">.</span><span class="n">added_triples</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
<span class="c"># Execute all the rules; these might fill up the added triples array</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span> <span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">rules</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="c"># Add the tuples to the graph (if necessary, that is). If any new triple has been generated, a new cycle</span>
<span class="c"># will be necessary...</span>
<span class="n">new_cycle</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">added_triples</span><span class="p">)</span> <span class="o">></span> <span class="mi">0</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">added_triples</span> <span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="MiniOWL.store_triple"><a class="viewcode-back" href="../../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.rdfs.html#rdflib.plugins.parsers.pyRdfa.rdfs.process.MiniOWL.store_triple">[docs]</a> <span class="k">def</span> <span class="nf">store_triple</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">t</span><span class="p">)</span> <span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> In contrast to its name, this does not yet add anything to the graph itself, it just stores the tuple in an</span>
<span class="sd"> L{internal set<added_triples>}. (It is important for this to be a set: some of the rules in the various closures may</span>
<span class="sd"> generate the same tuples several times.) Before adding the tuple to the set, the method checks whether</span>
<span class="sd"> the tuple is in the final graph already (if yes, it is not added to the set).</span>
<span class="sd"> The set itself is emptied at the start of every processing cycle; the triples are then effectively added to the</span>
<span class="sd"> graph at the end of such a cycle. If the set is</span>
<span class="sd"> actually empty at that point, this means that the cycle has not added any new triple, and the full processing can stop.</span>
<span class="sd"> @param t: the triple to be added to the graph, unless it is already there</span>
<span class="sd"> @type t: a 3-element tuple of (s,p,o)</span>
<span class="sd"> """</span>
<span class="p">(</span><span class="n">s</span><span class="p">,</span><span class="n">p</span><span class="p">,</span><span class="n">o</span><span class="p">)</span> <span class="o">=</span> <span class="n">t</span>
<span class="k">if</span> <span class="n">t</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">added_triples</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="MiniOWL.rules"><a class="viewcode-back" href="../../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.rdfs.html#rdflib.plugins.parsers.pyRdfa.rdfs.process.MiniOWL.rules">[docs]</a> <span class="k">def</span> <span class="nf">rules</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">t</span><span class="p">)</span> <span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Go through the OWL-RL entailement rules prp-spo1, prp-eqp1, prp-eqp2, cax-sco, cax-eqc1, and cax-eqc2 by extending the graph.</span>
<span class="sd"> @param t: a triple (in the form of a tuple)</span>
<span class="sd"> """</span>
<span class="n">s</span><span class="p">,</span><span class="n">p</span><span class="p">,</span><span class="n">o</span> <span class="o">=</span> <span class="n">t</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema_semantics</span> <span class="p">:</span>
<span class="c"># extra resonings on the vocabulary only to reduce the overall load by reducing the expected number of chaining cycles</span>
<span class="k">if</span> <span class="n">p</span> <span class="o">==</span> <span class="n">subPropertyOf</span> <span class="p">:</span>
<span class="k">for</span> <span class="n">Z</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">xxx</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="n">o</span><span class="p">,</span> <span class="n">subPropertyOf</span><span class="p">,</span> <span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">s</span><span class="p">,</span><span class="n">subPropertyOf</span><span class="p">,</span><span class="n">xxx</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">p</span> <span class="o">==</span> <span class="n">equivalentProperty</span> <span class="p">:</span>
<span class="k">for</span> <span class="n">Z</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">xxx</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="n">o</span><span class="p">,</span> <span class="n">equivalentProperty</span><span class="p">,</span> <span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">s</span><span class="p">,</span><span class="n">equivalentProperty</span><span class="p">,</span><span class="n">xxx</span><span class="p">))</span>
<span class="k">for</span> <span class="n">xxx</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">Z</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="n">equivalentProperty</span><span class="p">,</span> <span class="n">s</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">xxx</span><span class="p">,</span><span class="n">equivalentProperty</span><span class="p">,</span><span class="n">o</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">p</span> <span class="o">==</span> <span class="n">subClassOf</span> <span class="p">:</span>
<span class="k">for</span> <span class="n">Z</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">xxx</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="n">o</span><span class="p">,</span> <span class="n">subClassOf</span><span class="p">,</span> <span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">s</span><span class="p">,</span><span class="n">subClassOf</span><span class="p">,</span><span class="n">xxx</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">p</span> <span class="o">==</span> <span class="n">equivalentClass</span> <span class="p">:</span>
<span class="k">for</span> <span class="n">Z</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">xxx</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="n">o</span><span class="p">,</span> <span class="n">equivalentClass</span><span class="p">,</span> <span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">s</span><span class="p">,</span><span class="n">equivalentClass</span><span class="p">,</span><span class="n">xxx</span><span class="p">))</span>
<span class="k">for</span> <span class="n">xxx</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">Z</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="n">equivalentClass</span><span class="p">,</span> <span class="n">s</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">xxx</span><span class="p">,</span><span class="n">equivalentClass</span><span class="p">,</span><span class="n">o</span><span class="p">))</span>
<span class="k">else</span> <span class="p">:</span>
<span class="k">if</span> <span class="n">p</span> <span class="o">==</span> <span class="n">subPropertyOf</span> <span class="p">:</span>
<span class="c"># prp-spo1</span>
<span class="k">for</span> <span class="n">zzz</span><span class="p">,</span><span class="n">Z</span><span class="p">,</span><span class="n">www</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="n">s</span><span class="p">,</span> <span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">zzz</span><span class="p">,</span> <span class="n">o</span><span class="p">,</span> <span class="n">www</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">p</span> <span class="o">==</span> <span class="n">equivalentProperty</span> <span class="p">:</span>
<span class="c"># prp-eqp1</span>
<span class="k">for</span> <span class="n">zzz</span><span class="p">,</span><span class="n">Z</span><span class="p">,</span><span class="n">www</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="n">s</span><span class="p">,</span> <span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">zzz</span><span class="p">,</span> <span class="n">o</span><span class="p">,</span> <span class="n">www</span><span class="p">))</span>
<span class="c"># prp-eqp2</span>
<span class="k">for</span> <span class="n">zzz</span><span class="p">,</span><span class="n">Z</span><span class="p">,</span><span class="n">www</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="n">o</span><span class="p">,</span> <span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">zzz</span><span class="p">,</span> <span class="n">s</span><span class="p">,</span> <span class="n">www</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">p</span> <span class="o">==</span> <span class="n">subClassOf</span> <span class="p">:</span>
<span class="c"># cax-sco</span>
<span class="k">for</span> <span class="n">vvv</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">Z</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="nb">type</span><span class="p">,</span> <span class="n">s</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">vvv</span><span class="p">,</span> <span class="nb">type</span><span class="p">,</span> <span class="n">o</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">p</span> <span class="o">==</span> <span class="n">equivalentClass</span> <span class="p">:</span>
<span class="c"># cax-eqc1</span>
<span class="k">for</span> <span class="n">vvv</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">Z</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="nb">type</span><span class="p">,</span> <span class="n">s</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">vvv</span><span class="p">,</span> <span class="nb">type</span><span class="p">,</span> <span class="n">o</span><span class="p">))</span>
<span class="c"># cax-eqc2</span>
<span class="k">for</span> <span class="n">vvv</span><span class="p">,</span><span class="n">Y</span><span class="p">,</span><span class="n">Z</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span> <span class="nb">type</span><span class="p">,</span> <span class="n">o</span><span class="p">))</span> <span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">store_triple</span><span class="p">((</span><span class="n">vvv</span><span class="p">,</span> <span class="nb">type</span><span class="p">,</span> <span class="n">s</span><span class="p">))</span>
<span class="c">########################################################################################################</span>
</div></div>
<div class="viewcode-block" id="process_rdfa_sem"><a class="viewcode-back" href="../../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.rdfs.html#rdflib.plugins.parsers.pyRdfa.rdfs.process.process_rdfa_sem">[docs]</a><span class="k">def</span> <span class="nf">process_rdfa_sem</span><span class="p">(</span><span class="n">graph</span><span class="p">,</span> <span class="n">options</span><span class="p">)</span> <span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Expand the graph through the minimal RDFS and OWL rules defined for RDFa.</span>
<span class="sd"> </span>
<span class="sd"> The expansion is done in several steps:</span>
<span class="sd"> 1. the vocabularies are retrieved from the incoming graph (there are RDFa triples generated for that)</span>
<span class="sd"> 2. all vocabularies are merged into a separate vocabulary graph</span>
<span class="sd"> 3. the RDFS/OWL expansion is done on the vocabulary graph, to take care of all the subproperty, subclass, etc, chains</span>
<span class="sd"> 4. the (expanded) vocabulary graph content is added to the incoming graph</span>
<span class="sd"> 5. the incoming graph is expanded</span>
<span class="sd"> 6. the triples appearing in the vocabulary graph are removed from the incoming graph, to avoid unnecessary extra triples from the data</span>
<span class="sd"> </span>
<span class="sd"> @param graph: an RDFLib Graph instance, to be expanded</span>
<span class="sd"> @param options: options as defined for the RDFa run; used to generate warnings</span>
<span class="sd"> @type options: L{pyRdfa.Options}</span>
<span class="sd"> """</span>
<span class="c"># 1. collect the vocab URI-s</span>
<span class="n">vocabs</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
<span class="kn">from</span> <span class="nn">pyRdfa</span> <span class="kn">import</span> <span class="n">RDFA_VOCAB</span>
<span class="k">for</span> <span class="p">((</span><span class="n">s</span><span class="p">,</span><span class="n">p</span><span class="p">,</span><span class="n">v</span><span class="p">))</span> <span class="ow">in</span> <span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="bp">None</span><span class="p">,</span><span class="n">RDFA_VOCAB</span><span class="p">,</span><span class="bp">None</span><span class="p">))</span> <span class="p">:</span>
<span class="n">vocabs</span><span class="o">.</span><span class="n">add</span><span class="p">((</span><span class="nb">str</span><span class="p">(</span><span class="n">v</span><span class="p">)))</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">vocabs</span><span class="p">)</span> <span class="o">>=</span> <span class="mi">0</span> <span class="p">:</span>
<span class="c"># 2. get all the vocab graphs</span>
<span class="n">vocab_graph</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">()</span>
<span class="k">for</span> <span class="n">uri</span> <span class="ow">in</span> <span class="n">vocabs</span> <span class="p">:</span>
<span class="k">if</span> <span class="n">options</span><span class="o">.</span><span class="n">vocab_cache</span> <span class="p">:</span>
<span class="n">v_graph</span> <span class="o">=</span> <span class="n">CachedVocab</span><span class="p">(</span><span class="n">uri</span><span class="p">,</span> <span class="n">options</span><span class="p">)</span><span class="o">.</span><span class="n">graph</span>
<span class="k">else</span> <span class="p">:</span>
<span class="p">(</span><span class="n">v_graph</span><span class="p">,</span> <span class="n">exp_date</span><span class="p">)</span> <span class="o">=</span> <span class="n">return_graph</span><span class="p">(</span><span class="n">uri</span><span class="p">,</span> <span class="n">options</span><span class="p">)</span>
<span class="k">if</span> <span class="n">v_graph</span> <span class="o">!=</span> <span class="bp">None</span> <span class="p">:</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">v_graph</span> <span class="p">:</span>
<span class="n">vocab_graph</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="c"># 3. Get the closure of the vocab graph; this will take care of local subproperty, etc, statements</span>
<span class="c"># Strictly speaking this is not necessary, but will speed up processing, because it may save chaining cycles on the</span>
<span class="c"># real graph</span>
<span class="n">MiniOWL</span><span class="p">(</span><span class="n">vocab_graph</span><span class="p">,</span> <span class="n">schema_semantics</span> <span class="o">=</span> <span class="bp">True</span><span class="p">)</span><span class="o">.</span><span class="n">closure</span><span class="p">()</span>
<span class="c"># 4. Now get the vocab graph content added to the default graph</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">vocab_graph</span> <span class="p">:</span>
<span class="n">graph</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="c"># 5. get the graph expanded through RDFS</span>
<span class="n">MiniOWL</span><span class="p">(</span><span class="n">graph</span><span class="p">)</span><span class="o">.</span><span class="n">closure</span><span class="p">()</span>
<span class="c"># 4. clean up the graph by removing the schema triples</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">vocab_graph</span> <span class="p">:</span> <span class="n">graph</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="c"># That was it...</span>
<span class="k">return</span> <span class="n">graph</span>
</pre></div></div>
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