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<h1><a href="../index.html">
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<ul><li><a href="../index.html">home</a></li>
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<!--Weave of 'Indefinite Appearance' generated by Inweb-->
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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>Indefinite Appearance</b></li></ul></div>
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<p class="purpose">When the source text comments on something with a sentence consisting only of a double-quoted literal text, we infer that as an indefinite appearance property.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>For instance:
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</p>
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<blockquote>
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<p>The drapery is in the Crypt. "The drapery hangs, poignantly waiting to fall."</p>
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</blockquote>
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<p class="commentary">This text will probably become a property of the drapery, but which property
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depends on the drapery's kind. That means we can't decide until after the
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source text is fully read, because we won't be certain of kinds until then.
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So as an interim measure the text is inferred into a pseudo-property called
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"indefinite appearance".
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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">Properties::Appearance::infer</span><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</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">inf</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">property_inf</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><a href="5-pi.html#SP7" class="function-link"><span class="function-syntax">PropertyInferences::get_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) == </span><span class="identifier-syntax">P_indefinite_appearance_text</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-ia.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">Issue a problem for a second appearance</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">prevailing_mood</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CERTAIN_CE</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><a href="4-ks.html#SP3" class="function-link"><span class="function-syntax">KindSubjects::to_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">)) &&</span>
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<span class="plain-syntax"> (</span><a href="4-is.html#SP10" class="function-link"><span class="function-syntax">InferenceSubjects::is_within</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><a href="4-ks.html#SP3" class="function-link"><span class="function-syntax">KindSubjects::from_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_object</span><span class="plain-syntax">))))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">prevailing_mood</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LIKELY_CE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="3-vp.html#SP9" class="function-link"><span class="function-syntax">ValueProperties::assert</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P_indefinite_appearance_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">spec</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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<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>§1.1. </b>...but we produce a firm and explicit problem message if somebody sets it
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ambiguously.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue a problem for a second appearance</span><span class="named-paragraph-number">1.1</span></span><span class="comment-syntax"> =</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="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::infs_contradiction_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TwoAppearances</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><a href="5-inf.html#SP3" class="function-link"><span class="function-syntax">Inferences::where_inferred</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">), </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"seems to have two different descriptions"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"perhaps because you intended the second description to apply to something "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"mentioned in between, but declared it in such a way that it was never the "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"subject of an assertion. For instance, 'The Forest Clearing is northeast of "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"the Woods.' makes the Forest Clearing the current room being discussed, but "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"'Northeast of the Woods is the Forest Clearing.' leaves the room under "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"discussion unchanged, because the Forest Clearing is not the subject of "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"the sentence."</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>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="5-ia.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>During stage II of world model completion, we will have to make those decisions
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about what property the indefinite appearance text should go into. This is
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called "reallocation", and as can be seen the method is:
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</p>
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<ul class="items"><li>(a) See if any plugin wants to take action;
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</li><li>(b) Otherwise reallocate to the "description" property, if available;
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</li><li>(c) Otherwise give up and issue a problem message.
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</li></ul>
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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">Properties::Appearance::reallocate</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">Properties::Appearance::reallocate</span></span>:<br/>The Model World - <a href="5-tmw.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</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">inf</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">property_inf</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><a href="5-pi.html#SP7" class="function-link"><span class="function-syntax">PropertyInferences::get_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) == </span><span class="identifier-syntax">P_indefinite_appearance_text</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">txt</span><span class="plain-syntax"> = </span><a href="5-pi.html#SP7" class="function-link"><span class="function-syntax">PropertyInferences::get_value</span></a><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="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP3" class="function-link"><span class="function-syntax">Inferences::where_inferred</span></a><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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">PluginCalls::default_appearance</span><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">txt</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</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">P_description</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> (</span><a href="4-pp.html#SP2" class="function-link"><span class="function-syntax">PropertyPermissions::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">P_description</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">))) {</span>
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<span class="plain-syntax"> </span><a href="3-vp.html#SP9" class="function-link"><span class="function-syntax">ValueProperties::assert</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P_description</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">txt</span><span class="plain-syntax">, </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::inference_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_IndefiniteTextMeaningless</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="string-syntax">"is not allowed"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"i.e., you can't write a double-quoted piece of text as a "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"sentence all by itself here. Some kinds or kinds of value "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"are allowed this - objects and scenes, for instance - but "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"most are not. (They would need to provide a 'description' "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"property.)"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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