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<!--Weave of 'Relation Inferences' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">knowledge</a></li><li><a href="index.html#5">Chapter 5: Modelling</a></li><li><b>Relation Inferences</b></li></ul></div>
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<p class="purpose">Inferences that a relation holds between two subjects or values.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Relation inferences are made about a relation, and say that two other
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subjects or values are related by it. Thus, if Charles "knows" Sebastian,
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this fact is an inference about the knowledge relation, not about either
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Charles or Sebastian, who are only the terms listed in its data.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">relation_inf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RelationInferences::start</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">RelationInferences::start</span></span>:<br/>Knowledge Module - <a href="1-km.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">relation_inf</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP10" class="function-link"><span class="function-syntax">Inferences::new_family</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"relation_inf"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">relation_inf</span><span class="plain-syntax">, </span><span class="constant-syntax">LOG_DETAILS_INF_MTID</span><span class="plain-syntax">, </span><a href="5-ri.html#SP5" class="function-link"><span class="function-syntax">RelationInferences::log_details</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">relation_inf</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPARE_INF_MTID</span><span class="plain-syntax">, </span><a href="5-ri.html#SP6" class="function-link"><span class="function-syntax">RelationInferences::cmp</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>Terms can be given either as subjects or as arbitrary values. This was a late
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change to Inform, which came in with dynamic relations between (say) numbers,
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and therefore the need to set up an initial state for those relations.
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</p>
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<p class="commentary">The terms will either both be subjects, or both be values, so at all times
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exactly one of these pairs of pointers is <span class="extract"><span class="extract-syntax">NULL</span></span>.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">terms_as_subjects</span><span class="plain-syntax">[2];</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">terms_as_values</span><span class="plain-syntax">[2];</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="function-syntax">RelationInferences::new</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">RelationInferences::new</span></span>:<br/><a href="5-ri.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj0</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj1</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val0</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">PROTECTED_MODEL_PROCEDURE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[0] = </span><a href="4-is.html#SP9" class="function-link"><span class="function-syntax">InferenceSubjects::divert</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[1] = </span><a href="4-is.html#SP9" class="function-link"><span class="function-syntax">InferenceSubjects::divert</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[0] = </span><span class="identifier-syntax">val0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[1] = </span><span class="identifier-syntax">val1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="5-inf.html#SP2" class="function-link"><span class="function-syntax">Inferences::create_inference</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">relation_inf</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">STORE_POINTER_relation_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">data</span><span class="plain-syntax">), </span><span class="identifier-syntax">prevailing_mood</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure relation_inference_data is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>As promised, these are drawn using either subjects or values, but not both:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RelationInferences::draw</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj0</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><a href="5-ri.html#SP3" class="function-link"><span class="function-syntax">RelationInferences::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj0</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj1</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="5-inf.html#SP8" class="function-link"><span class="function-syntax">Inferences::join_inference</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><a href="4-rs.html#SP1" class="function-link"><span class="function-syntax">RelationSubjects::from_bp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RelationInferences::draw_spec</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val0</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">val0</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">val1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"malformed value relation"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><a href="5-ri.html#SP3" class="function-link"><span class="function-syntax">RelationInferences::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">val0</span><span class="plain-syntax">, </span><span class="identifier-syntax">val1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="5-inf.html#SP8" class="function-link"><span class="function-syntax">Inferences::join_inference</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><a href="4-rs.html#SP1" class="function-link"><span class="function-syntax">RelationSubjects::from_bp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>And here are the method calls:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RelationInferences::log_details</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">RelationInferences::log_details</span></span>:<br/><a href="5-ri.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_relation_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">-></span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[0]) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"-1:$j"</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[0]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[1]) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"-2:$j"</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[1]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[0]) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"-s1:$P"</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[0]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[1]) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"-s2:$P"</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[1]);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>Note that the topic of a relation inference depends on both terms. If
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Charles knows Sebastian and Charles also knows Julia, then these two inferences
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both belong to the knowledge relation, but "differ in topic", so that there
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is no contradiction. If in fact the knowledge relation wants to make this a
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one-to-one relationship, it will have to detect the contradiction of Charles
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knowing both of them elsewhere: the inference machinery can't do so for it.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">RelationInferences::cmp</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">RelationInferences::cmp</span></span>:<br/><a href="5-ri.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i1</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i2</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_relation_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i1</span><span class="plain-syntax">-></span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_relation_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i2</span><span class="plain-syntax">-></span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_infs</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data1</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[1]) -</span>
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<span class="plain-syntax"> </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_infs</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data2</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[1]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -</span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_infs</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data1</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[0]) -</span>
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<span class="plain-syntax"> </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_infs</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data2</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[0]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -</span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_pn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data1</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[1]) -</span>
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<span class="plain-syntax"> </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_pn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data2</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[1]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -</span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_pn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data1</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[0]) -</span>
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<span class="plain-syntax"> </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_pn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">data2</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[0]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -</span><span class="constant-syntax">CI_DIFFER_IN_TOPIC</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_inf</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i1</span><span class="plain-syntax">) - </span><a href="5-inf.html#SP7" class="function-link"><span class="function-syntax">Inferences::measure_inf</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">CI_DIFFER_IN_COPY_ONLY</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -</span><span class="constant-syntax">CI_DIFFER_IN_COPY_ONLY</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">CI_IDENTICAL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>And finally two access functions:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RelationInferences::get_term_subjects</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">RelationInferences::get_term_subjects</span></span>:<br/>Relation Subjects - <a href="4-rs.html#SP3">§3</a><br/>The Model World - <a href="5-tmw.html#SP4_3">§4.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> **</span><span class="identifier-syntax">subj1</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> **</span><span class="identifier-syntax">infs2</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">i</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">i</span><span class="plain-syntax">-></span><span class="element-syntax">family</span><span class="plain-syntax"> != </span><span class="identifier-syntax">relation_inf</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"not a relation inf"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_relation_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">-></span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">subj1</span><span class="plain-syntax">) *</span><span class="identifier-syntax">subj1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[0];</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">infs2</span><span class="plain-syntax">) *</span><span class="identifier-syntax">infs2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_subjects</span><span class="plain-syntax">[1];</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RelationInferences::get_term_specs</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">RelationInferences::get_term_specs</span></span>:<br/>Relation Subjects - <a href="4-rs.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> **</span><span class="identifier-syntax">val1</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> **</span><span class="identifier-syntax">spec2</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">i</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">i</span><span class="plain-syntax">-></span><span class="element-syntax">family</span><span class="plain-syntax"> != </span><span class="identifier-syntax">relation_inf</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"not a relation inf"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">relation_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_relation_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">-></span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">val1</span><span class="plain-syntax">) *</span><span class="identifier-syntax">val1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[0];</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">spec2</span><span class="plain-syntax">) *</span><span class="identifier-syntax">spec2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data</span><span class="plain-syntax">-></span><span class="element-syntax">terms_as_values</span><span class="plain-syntax">[1];</span>
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<span class="plain-syntax">}</span>
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</pre>
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