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.

§1. For instance:

The drapery is in the Crypt. "The drapery hangs, poignantly waiting to fall."

This text will probably become a property of the drapery, but which property depends on the drapery's kind. That means we can't decide until after the source text is fully read, because we won't be certain of kinds until then. So as an interim measure the text is inferred into a pseudo-property called "indefinite appearance".

void Properties::Appearance::infer(inference_subject *infs, parse_node *spec) {
    inference *inf;
    KNOWLEDGE_LOOP(inf, infs, property_inf)
        if (PropertyInferences::get_property(inf) == P_indefinite_appearance_text)
            Issue a problem for a second appearance1.1;

    prevailing_mood = CERTAIN_CE;
    if ((KindSubjects::to_kind(infs)) &&
        (InferenceSubjects::is_within(infs, KindSubjects::from_kind(K_object))))
        prevailing_mood = LIKELY_CE;
    ValueProperties::assert(P_indefinite_appearance_text, infs, spec, prevailing_mood);
}

§1.1. ...but we produce a firm and explicit problem message if somebody sets it ambiguously.

Issue a problem for a second appearance1.1 =

    StandardProblems::infs_contradiction_problem(_p_(PM_TwoAppearances),
        Inferences::where_inferred(inf), current_sentence, infs,
        "seems to have two different descriptions",
        "perhaps because you intended the second description to apply to something "
        "mentioned in between, but declared it in such a way that it was never the "
        "subject of an assertion. For instance, 'The Forest Clearing is northeast of "
        "the Woods.' makes the Forest Clearing the current room being discussed, but "
        "'Northeast of the Woods is the Forest Clearing.' leaves the room under "
        "discussion unchanged, because the Forest Clearing is not the subject of "
        "the sentence.");
    return;

• This code is used in §1.

§2. During stage II of world model completion, we will have to make those decisions about what property the indefinite appearance text should go into. This is called "reallocation", and as can be seen the method is:

• (a) See if any plugin wants to take action;
• (b) Otherwise reallocate to the "description" property, if available;
• (c) Otherwise give up and issue a problem message.

void Properties::Appearance::reallocate?Usage of Properties::Appearance::reallocate:
The Model World - §3(inference_subject *infs) {
    inference *inf;
    KNOWLEDGE_LOOP(inf, infs, property_inf) {
        if (PropertyInferences::get_property(inf) == P_indefinite_appearance_text) {
            parse_node *txt = PropertyInferences::get_value(inf);
            current_sentence = Inferences::where_inferred(inf);
            if (PluginCalls::default_appearance(infs, txt) == FALSE) {
                if ((P_description) &&
                    (PropertyPermissions::find(infs, P_description, TRUE))) {
                    ValueProperties::assert(P_description, infs, txt, CERTAIN_CE);
                } else StandardProblems::inference_problem(_p_(PM_IndefiniteTextMeaningless),
                    infs, inf, "is not allowed",
                    "i.e., you can't write a double-quoted piece of text as a "
                    "sentence all by itself here. Some kinds or kinds of value "
                    "are allowed this - objects and scenes, for instance - but "
                    "most are not. (They would need to provide a 'description' "
                    "property.)");
            }
        }
    }
}