vocabmerge: a subject scheme, supplied rather than compiled in

crates/bibclean/README.md

@@ -251,7 +251,7 @@ One heading per line — an `id`, a `name`, and the `count` of works under it:
 | `--rules <FILE>` | Vocabulary specific to this collection |
 | `--man` | Write this page as a manual page, in roff |
 
-The rules file is JSON, and today holds one thing:
+The rules file is JSON and holds two things.
 
 ```json
 {"device_prefixes": ["alexskobo"]}
@@ -261,6 +261,57 @@ An e-reader stamps its own name onto every book it touches. The generic device
 names are built in; one named after its owner is a fact about a single
 collection, so it is supplied rather than compiled in.
 
+### A subject scheme
+
+The other thing is a closed list of subjects to file under. A catalogue that
+lets anything be a subject ends up with forty thousand of them and no way to
+browse; a scheme is the other approach.
+
+```json
+{
+  "scheme": {
+    "subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Fiction"],
+    "aliases": {"Philosophie": "Philosophy", "Church History": "History"},
+    "drop": ["General", "Humanities", "Non-Fiction"],
+    "parents": {"Phenomenology": "Philosophy"},
+    "blocks_fiction": ["Biography"],
+    "fiction_genres": ["Fiction"]
+  }
+}
+```
+
+Which subjects a collection uses is the most collection-specific thing there
+is — a theology library and a science library agree on none of them — so it
+arrives in the file rather than compiled in.
+
+With one, every heading nothing else has already claimed gets an answer: a
+spelling the scheme knows is a merge onto the spelling it uses, and a heading
+the scheme does not have at all is a delete.
+
+```
+$ vocabmerge --kind tag --rules scheme.json tags.ndjson
+{"kind":"tag","action":"merge","keep":"Philosophy","drop":"Philosophie",…,"method":"scheme_alias","confidence":0.95,"evidence":"the scheme files \"Philosophie\" under \"Philosophy\""}
+{"kind":"tag","action":"delete","keep":null,"drop":"General",…,"method":"scheme_absent","confidence":0.8,"evidence":"\"General\" is not in the scheme, on 88 books"}
+{"kind":"tag","action":"delete","keep":null,"drop":"Underwater Basketry",…,"method":"scheme_absent","confidence":0.8,"evidence":"\"Underwater Basketry\" is not in the scheme, on 1 books"}
+{"kind":"tag","action":"merge","keep":"History","drop":"Church History",…,"method":"scheme_alias","confidence":0.95,"evidence":"the scheme files \"Church History\" under \"History\""}
+```
+
+The deletes are the lower confidence of the two on purpose: an alias is a
+statement the scheme makes, while an absence only says the scheme does not
+list it — which may equally mean the scheme is short a heading.
+
+Four rules the scheme applies, for anything using it as a library:
+
+- **Parents come along.** Phenomenology files under Philosophy and
+  Phenomenology, so a shelf browsed by the parent still finds the child.
+- **Order is scheme order**, not the order the headings arrived in.
+- **A study is not a novel.** A work already under a heading in
+  `blocks_fiction` — or whose title says "Companion to", "A Life of", "Diary",
+  "Very Short Introduction" — loses the `fiction_genres`. A historical novel
+  may still be both.
+- **A book tagged only with headings the scheme rejects has no subject yet**,
+  which is what a catalogue built from filenames looks like.
+
 ### Exit codes
 
 | Code | Meaning |

crates/bibclean/src/lib.rs

@@ -17,6 +17,7 @@ pub mod fix;
 pub mod isbn;
 pub mod matching;
 pub mod reasons;
+pub mod scheme;
 pub mod slug;
 pub mod vocab;
 

crates/bibclean/src/scheme.rs

@@ -0,0 +1,304 @@
+//! A closed subject scheme, and what it says about a heading.
+//!
+//! A catalogue that lets anything be a subject ends up with forty thousand of
+//! them and no way to browse. A scheme is the other approach: a fixed list of
+//! headings, everything else mapped onto one or dropped.
+//!
+//! The scheme itself is supplied rather than compiled in. Which subjects a
+//! collection uses, and what its parents are, is the most collection-specific
+//! thing there is — a theology library and a science library agree on nothing
+//! here — so it arrives as a file and this only knows what to do with one.
+
+use std::collections::HashMap;
+use std::sync::LazyLock;
+
+use fancy_regex::Regex;
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+
+/// Titles that say the book is *about* somebody rather than by them, or is a
+/// study rather than a story.
+///
+/// General reference rather than collection-specific: a Companion is a
+/// Companion on any shelf.
+static STUDY_TITLE: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(r"(?i)\b(companion to|guidebook to|very short introduction|letters of|collected letters|memoirs?\b|autobiograph|\bdiary\b|\bessays\b|\blectures\b|\bspeeches\b|a life of|biography of)\b")
+        .expect("a valid pattern")
+});
+
+/// A subject scheme: what the headings are, and how they relate.
+#[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize, JsonSchema)]
+pub struct Scheme {
+    /// Every heading the scheme allows, in the order they should be listed.
+    #[serde(default)]
+    pub subjects: Vec<String>,
+    /// Spellings that mean one of the subjects: alias to subject.
+    #[serde(default)]
+    pub aliases: HashMap<String, String>,
+    /// Headings too broad or too incidental to keep, whatever they say.
+    #[serde(default)]
+    pub drop: Vec<String>,
+    /// Which subject each subject sits under, child to parent.
+    #[serde(default)]
+    pub parents: HashMap<String, String>,
+    /// Subjects that mean the work is a study, so it cannot also be fiction.
+    #[serde(default)]
+    pub blocks_fiction: Vec<String>,
+    /// The genres a study blocks.
+    #[serde(default)]
+    pub fiction_genres: Vec<String>,
+}
+
+impl Scheme {
+    /// Whether the scheme says anything at all.
+    pub fn is_empty(&self) -> bool {
+        self.subjects.is_empty()
+    }
+
+    /// The subject a heading means, or `None` if it is not one.
+    ///
+    /// Exact first, then an alias. A heading on the drop list is not a
+    /// subject however it is spelled, and the brackets a catalogue wraps its
+    /// own annotations in are stripped before the comparison.
+    pub fn canonical(&self, name: &str) -> Option<&str> {
+        let name = name.trim();
+        if name.is_empty() {
+            return None;
+        }
+        let lower = name.to_lowercase();
+        let bare = lower.trim_matches(|c: char| "*[]".contains(c));
+
+        if self.drop.iter().any(|drop| {
+            let drop = drop.to_lowercase();
+            let drop = drop.trim_matches(|c: char| "*[]".contains(c));
+            drop == lower || drop == bare
+        }) {
+            return None;
+        }
+        if let Some(found) = self.subjects.iter().find(|s| s.to_lowercase() == lower) {
+            return Some(found);
+        }
+        self.aliases
+            .iter()
+            .find(|(alias, _)| alias.to_lowercase() == lower)
+            .map(|(_, subject)| subject.as_str())
+    }
+
+    /// Every chosen subject, with the parent of each carried alongside it.
+    ///
+    /// Phenomenology becomes Philosophy and Phenomenology, so a shelf browsed
+    /// by the parent still finds the child. Returned in scheme order, which
+    /// is the order a reader expects to see them listed.
+    pub fn with_parents(&self, subjects: &[String]) -> Vec<String> {
+        let mut chosen: Vec<&str> = Vec::new();
+        for subject in subjects {
+            if !self.subjects.iter().any(|s| s == subject) {
+                continue;
+            }
+            chosen.push(subject);
+            if let Some(parent) = self.parents.get(subject) {
+                chosen.push(parent);
+            }
+        }
+        self.in_order(&chosen)
+    }
+
+    /// Drop the fiction genres where the work is plainly a study.
+    ///
+    /// A historical novel may be fiction and history at once. A life of
+    /// somebody, a Companion, or a writer's diary may not be a novel.
+    pub fn without_impossible_fiction(
+        &self,
+        subjects: &[String],
+        title: Option<&str>,
+    ) -> Vec<String> {
+        let study = title.is_some_and(|title| STUDY_TITLE.is_match(title).unwrap_or(false));
+        let blocked = subjects
+            .iter()
+            .any(|s| self.blocks_fiction.iter().any(|block| block == s));
+
+        let kept: Vec<&str> = subjects
+            .iter()
+            .map(String::as_str)
+            .filter(|subject| {
+                !(study || blocked) || !self.fiction_genres.iter().any(|genre| genre == subject)
+            })
+            .collect();
+        self.in_order(&kept)
+    }
+
+    /// The subjects a book should carry: the chosen ones, their parents, and
+    /// nothing the title rules out.
+    pub fn compose(&self, subjects: &[String], title: Option<&str>) -> Vec<String> {
+        self.without_impossible_fiction(&self.with_parents(subjects), title)
+    }
+
+    /// Whether a book has no real subject yet.
+    ///
+    /// Untagged, or tagged only with headings the scheme does not recognise —
+    /// which is what a catalogue built from filenames looks like.
+    pub fn needs_subject(&self, existing: &[String]) -> bool {
+        !existing.iter().any(|tag| self.canonical(tag).is_some())
+    }
+
+    /// The given headings, deduplicated and in scheme order.
+    fn in_order(&self, chosen: &[&str]) -> Vec<String> {
+        self.subjects
+            .iter()
+            .filter(|subject| chosen.contains(&subject.as_str()))
+            .cloned()
+            .collect()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn scheme() -> Scheme {
+        Scheme {
+            subjects: [
+                "Philosophy",
+                "Phenomenology",
+                "History",
+                "Biography",
+                "Fiction",
+                "Science Fiction",
+            ]
+            .iter()
+            .map(|s| s.to_string())
+            .collect(),
+            aliases: [("Philosophie", "Philosophy"), ("SF", "Science Fiction")]
+                .iter()
+                .map(|(a, b)| (a.to_string(), b.to_string()))
+                .collect(),
+            drop: ["General", "Humanities", "Non-Fiction"]
+                .iter()
+                .map(|s| s.to_string())
+                .collect(),
+            parents: [("Phenomenology", "Philosophy")]
+                .iter()
+                .map(|(a, b)| (a.to_string(), b.to_string()))
+                .collect(),
+            blocks_fiction: vec!["Biography".into()],
+            fiction_genres: vec!["Fiction".into(), "Science Fiction".into()],
+        }
+    }
+
+    fn subjects(names: &[&str]) -> Vec<String> {
+        names.iter().map(|s| s.to_string()).collect()
+    }
+
+    #[test]
+    fn a_heading_in_the_scheme_is_itself() {
+        assert_eq!(scheme().canonical("Philosophy"), Some("Philosophy"));
+        assert_eq!(scheme().canonical("philosophy"), Some("Philosophy"));
+    }
+
+    #[test]
+    fn an_alias_is_the_subject_it_means() {
+        assert_eq!(scheme().canonical("Philosophie"), Some("Philosophy"));
+        assert_eq!(scheme().canonical("sf"), Some("Science Fiction"));
+    }
+
+    #[test]
+    fn a_heading_on_the_drop_list_is_not_a_subject() {
+        assert_eq!(scheme().canonical("General"), None);
+        // Including inside the brackets a catalogue wraps its own notes in.
+        assert_eq!(scheme().canonical("[General]"), None);
+        assert_eq!(scheme().canonical("*Humanities*"), None);
+    }
+
+    #[test]
+    fn a_heading_the_scheme_never_heard_of_is_not_a_subject() {
+        assert_eq!(scheme().canonical("Underwater Basketry"), None);
+        assert_eq!(scheme().canonical(""), None);
+        assert_eq!(scheme().canonical("   "), None);
+    }
+
+    #[test]
+    fn a_child_carries_its_parent() {
+        assert_eq!(
+            scheme().with_parents(&subjects(&["Phenomenology"])),
+            ["Philosophy", "Phenomenology"]
+        );
+    }
+
+    #[test]
+    fn subjects_come_back_in_scheme_order_however_they_went_in() {
+        assert_eq!(
+            scheme().with_parents(&subjects(&["History", "Philosophy"])),
+            ["Philosophy", "History"]
+        );
+    }
+
+    #[test]
+    fn a_heading_outside_the_scheme_is_dropped_rather_than_carried() {
+        assert_eq!(
+            scheme().with_parents(&subjects(&["Basketry"])),
+            Vec::<String>::new()
+        );
+    }
+
+    #[test]
+    fn a_biography_is_not_also_a_novel() {
+        assert_eq!(
+            scheme().without_impossible_fiction(&subjects(&["Biography", "Fiction"]), None),
+            ["Biography"]
+        );
+    }
+
+    #[test]
+    fn a_title_that_says_study_rules_out_fiction_on_its_own() {
+        for title in [
+            "The Cambridge Companion to Nietzsche",
+            "Logic: A Very Short Introduction",
+            "A Life of Wrangel",
+            "The Diary of a Writer",
+        ] {
+            assert_eq!(
+                scheme()
+                    .without_impossible_fiction(&subjects(&["Fiction", "History"]), Some(title)),
+                ["History"],
+                "{title}"
+            );
+        }
+    }
+
+    #[test]
+    fn a_historical_novel_may_still_be_both() {
+        assert_eq!(
+            scheme().without_impossible_fiction(
+                &subjects(&["Fiction", "History"]),
+                Some("War and Peace")
+            ),
+            ["History", "Fiction"]
+        );
+    }
+
+    #[test]
+    fn composing_does_the_parents_and_the_fiction_rule_at_once() {
+        assert_eq!(
+            scheme().compose(
+                &subjects(&["Phenomenology", "Fiction"]),
+                Some("A Life of Husserl")
+            ),
+            ["Philosophy", "Phenomenology"]
+        );
+    }
+
+    #[test]
+    fn a_book_tagged_only_with_rubbish_still_needs_a_subject() {
+        assert!(scheme().needs_subject(&[]));
+        assert!(scheme().needs_subject(&subjects(&["General", "ebook"])));
+        assert!(!scheme().needs_subject(&subjects(&["General", "Philosophy"])));
+    }
+
+    #[test]
+    fn an_empty_scheme_says_nothing_about_anything() {
+        let empty = Scheme::default();
+        assert!(empty.is_empty());
+        assert_eq!(empty.canonical("Philosophy"), None);
+        assert!(empty.needs_subject(&subjects(&["Philosophy"])));
+    }
+}

crates/bibclean/src/vocab.rs

@@ -163,6 +163,13 @@ pub struct Rules {
     /// A device named after its owner belongs here and not in the program.
     #[serde(default)]
     pub device_prefixes: Vec<String>,
+    /// The closed subject scheme this collection files under, if it has one.
+    ///
+    /// Which subjects a collection uses is the most collection-specific thing
+    /// there is — a theology library and a science library agree on none of
+    /// them — so it arrives here rather than being compiled in.
+    #[serde(default)]
+    pub scheme: crate::scheme::Scheme,
 }
 
 /// Every proposal a list of headings suggests.
@@ -179,6 +186,68 @@ pub fn cluster(kind: Kind, items: &[Item], rules: &Rules) -> Vec<Proposal> {
     }
     if kind == Kind::Tag {
         out.extend(junk_deletes(items, &grouped, rules));
+        out.extend(scheme_proposals(items, &out, &rules.scheme));
+    }
+    out
+}
+
+/// What a subject scheme says about the headings nothing else has claimed.
+///
+/// A heading the scheme spells differently is a merge onto the spelling it
+/// uses; a heading the scheme does not have at all is a delete. Headings
+/// already spoken for by a near-duplicate group or by the junk rules are left
+/// alone, so nothing gets two proposals.
+fn scheme_proposals(
+    items: &[Item],
+    already: &[Proposal],
+    scheme: &crate::scheme::Scheme,
+) -> Vec<Proposal> {
+    if scheme.is_empty() {
+        return Vec::new();
+    }
+    let spoken_for: Vec<i64> = already.iter().map(|proposal| proposal.drop_id).collect();
+    let mut out = Vec::new();
+
+    for item in items {
+        if spoken_for.contains(&item.id) {
+            continue;
+        }
+        match scheme.canonical(&item.name) {
+            // Already the scheme's own spelling: nothing to say.
+            Some(subject) if subject == item.name => {}
+            Some(subject) => {
+                let keep = items.iter().find(|other| other.name == subject);
+                out.push(Proposal {
+                    kind: Kind::Tag.name().to_string(),
+                    action: "merge".to_string(),
+                    keep: Some(subject.to_string()),
+                    drop: item.name.clone(),
+                    keep_id: keep.map(|keep| keep.id),
+                    drop_id: item.id,
+                    keep_count: keep.map_or(0, |keep| keep.count),
+                    drop_count: item.count,
+                    method: "scheme_alias".to_string(),
+                    confidence: 0.95,
+                    evidence: format!("the scheme files {:?} under {subject:?}", item.name),
+                });
+            }
+            None => out.push(Proposal {
+                kind: Kind::Tag.name().to_string(),
+                action: "delete".to_string(),
+                keep: None,
+                drop: item.name.clone(),
+                keep_id: None,
+                drop_id: item.id,
+                keep_count: 0,
+                drop_count: item.count,
+                method: "scheme_absent".to_string(),
+                confidence: 0.8,
+                evidence: format!(
+                    "{:?} is not in the scheme, on {} books",
+                    item.name, item.count
+                ),
+            }),
+        }
     }
     out
 }
@@ -730,6 +799,7 @@ mod tests {
     fn a_device_named_after_its_owner_comes_from_the_rules() {
         let rules = Rules {
             device_prefixes: vec!["alexskobo".into()],
+            ..Rules::default()
         };
         assert_eq!(junk_reason("[alexskobo] to read", &Rules::default()), None);
         assert_eq!(

parity/cases/subjects/cases.ndjson

@@ -0,0 +1,67 @@
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-0", "kind": "canonical", "tag": "Philosophy"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-1", "kind": "canonical", "tag": "philosophy"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-2", "kind": "canonical", "tag": "PHILOSOPHY"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-3", "kind": "canonical", "tag": " Philosophy "}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-4", "kind": "canonical", "tag": "Philosophie"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-5", "kind": "canonical", "tag": "SF"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-6", "kind": "canonical", "tag": "sf"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-7", "kind": "canonical", "tag": "Sci-Fi"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-8", "kind": "canonical", "tag": "General"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "canonical-9", "kind": "canonical", "tag": "general"}
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+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-43", "kind": "fiction", "subjects": ["Fiction", "History"], "title": "Memoirs of a Geisha"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-44", "kind": "fiction", "subjects": ["Fiction", "History"], "title": "Essays in Idleness"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-45", "kind": "fiction", "subjects": ["Science Fiction", "Fantasy", "Biography"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-46", "kind": "fiction", "subjects": ["Literary Criticism", "Fantasy"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-47", "kind": "fiction", "subjects": ["Fiction"], "title": "An Autobiography"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-48", "kind": "fiction", "subjects": ["Fiction"], "title": "Lectures on Ethics"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-49", "kind": "fiction", "subjects": ["Fiction"], "title": "Speeches"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-50", "kind": "fiction", "subjects": ["Fiction"], "title": "The Guidebook to Kant"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "fiction-51", "kind": "fiction", "subjects": ["Fiction"], "title": "Ordinary Title"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "compose-52", "kind": "compose", "subjects": ["Phenomenology", "Fiction"], "title": "A Life of Husserl"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "compose-53", "kind": "compose", "subjects": ["Phenomenology", "Fiction"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "compose-54", "kind": "compose", "subjects": ["Literary Criticism", "Fiction"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "compose-55", "kind": "compose", "subjects": ["Basketry", "Fiction"], "title": "A Life of Someone"}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "compose-56", "kind": "compose", "subjects": []}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-57", "kind": "needs", "existing": []}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-58", "kind": "needs", "existing": ["General"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-59", "kind": "needs", "existing": ["General", "ebook"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-60", "kind": "needs", "existing": ["Philosophy"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-61", "kind": "needs", "existing": ["General", "Philosophy"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-62", "kind": "needs", "existing": ["Underwater Basketry"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-63", "kind": "needs", "existing": ["SF"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-64", "kind": "needs", "existing": ["sf", "General"]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-65", "kind": "needs", "existing": [""]}
+{"scheme": {"subjects": ["Philosophy", "Phenomenology", "Theology", "History", "Biography", "Literary Criticism", "Fiction", "Science Fiction", "Fantasy"], "aliases": {"Philosophie": "Philosophy", "SF": "Science Fiction", "Sci-Fi": "Science Fiction", "Church History": "History", "Lit Crit": "Literary Criticism"}, "drop": ["General", "Humanities", "Non-Fiction", "Nonfiction", "ebook", "book", "[General]", "*Misc*"], "parents": {"Phenomenology": "Philosophy", "Literary Criticism": "History"}, "blocks_fiction": ["Biography", "Literary Criticism"], "fiction_genres": ["Fiction", "Science Fiction", "Fantasy"]}, "name": "needs-66", "kind": "needs", "existing": ["[General]"]}

parity/golden/subjects/cases.ndjson

@@ -0,0 +1,67 @@
+{"kind": "canonical", "name": "canonical-0", "subject": "Philosophy"}
+{"kind": "canonical", "name": "canonical-1", "subject": "Philosophy"}
+{"kind": "canonical", "name": "canonical-2", "subject": "Philosophy"}
+{"kind": "canonical", "name": "canonical-3", "subject": "Philosophy"}
+{"kind": "canonical", "name": "canonical-4", "subject": "Philosophy"}
+{"kind": "canonical", "name": "canonical-5", "subject": "Science Fiction"}
+{"kind": "canonical", "name": "canonical-6", "subject": "Science Fiction"}
+{"kind": "canonical", "name": "canonical-7", "subject": "Science Fiction"}
+{"kind": "canonical", "name": "canonical-8", "subject": null}
+{"kind": "canonical", "name": "canonical-9", "subject": null}
+{"kind": "canonical", "name": "canonical-10", "subject": null}
+{"kind": "canonical", "name": "canonical-11", "subject": null}
+{"kind": "canonical", "name": "canonical-12", "subject": null}
+{"kind": "canonical", "name": "canonical-13", "subject": null}
+{"kind": "canonical", "name": "canonical-14", "subject": null}
+{"kind": "canonical", "name": "canonical-15", "subject": null}
+{"kind": "canonical", "name": "canonical-16", "subject": null}
+{"kind": "canonical", "name": "canonical-17", "subject": "History"}
+{"kind": "canonical", "name": "canonical-18", "subject": "Literary Criticism"}
+{"kind": "canonical", "name": "canonical-19", "subject": null}
+{"kind": "canonical", "name": "canonical-20", "subject": null}
+{"kind": "canonical", "name": "canonical-21", "subject": null}
+{"kind": "canonical", "name": "canonical-22", "subject": null}
+{"kind": "canonical", "name": "canonical-23", "subject": null}
+{"kind": "canonical", "name": "canonical-24", "subject": "Fiction"}
+{"kind": "parents", "name": "parents-25", "subjects": ["Philosophy", "Phenomenology"]}
+{"kind": "parents", "name": "parents-26", "subjects": ["Philosophy"]}
+{"kind": "parents", "name": "parents-27", "subjects": ["Philosophy", "History"]}
+{"kind": "parents", "name": "parents-28", "subjects": []}
+{"kind": "parents", "name": "parents-29", "subjects": ["History", "Literary Criticism"]}
+{"kind": "parents", "name": "parents-30", "subjects": ["Philosophy", "Phenomenology", "History", "Literary Criticism"]}
+{"kind": "parents", "name": "parents-31", "subjects": []}
+{"kind": "parents", "name": "parents-32", "subjects": ["Fiction", "Science Fiction"]}
+{"kind": "parents", "name": "parents-33", "subjects": ["Philosophy"]}
+{"kind": "parents", "name": "parents-34", "subjects": ["Philosophy", "Phenomenology", "Fantasy"]}
+{"kind": "fiction", "name": "fiction-35", "subjects": ["Biography"]}
+{"kind": "fiction", "name": "fiction-36", "subjects": ["History", "Fiction"]}
+{"kind": "fiction", "name": "fiction-37", "subjects": ["History", "Fiction"]}
+{"kind": "fiction", "name": "fiction-38", "subjects": ["History"]}
+{"kind": "fiction", "name": "fiction-39", "subjects": ["History"]}
+{"kind": "fiction", "name": "fiction-40", "subjects": ["History"]}
+{"kind": "fiction", "name": "fiction-41", "subjects": ["History"]}
+{"kind": "fiction", "name": "fiction-42", "subjects": ["History"]}
+{"kind": "fiction", "name": "fiction-43", "subjects": ["History"]}
+{"kind": "fiction", "name": "fiction-44", "subjects": ["History"]}
+{"kind": "fiction", "name": "fiction-45", "subjects": ["Biography"]}
+{"kind": "fiction", "name": "fiction-46", "subjects": ["Literary Criticism"]}
+{"kind": "fiction", "name": "fiction-47", "subjects": ["Fiction"]}
+{"kind": "fiction", "name": "fiction-48", "subjects": []}
+{"kind": "fiction", "name": "fiction-49", "subjects": []}
+{"kind": "fiction", "name": "fiction-50", "subjects": []}
+{"kind": "fiction", "name": "fiction-51", "subjects": ["Fiction"]}
+{"kind": "compose", "name": "compose-52", "subjects": ["Philosophy", "Phenomenology"]}
+{"kind": "compose", "name": "compose-53", "subjects": ["Philosophy", "Phenomenology", "Fiction"]}
+{"kind": "compose", "name": "compose-54", "subjects": ["History", "Literary Criticism"]}
+{"kind": "compose", "name": "compose-55", "subjects": []}
+{"kind": "compose", "name": "compose-56", "subjects": []}
+{"kind": "needs", "name": "needs-57", "needs": true}
+{"kind": "needs", "name": "needs-58", "needs": true}
+{"kind": "needs", "name": "needs-59", "needs": true}
+{"kind": "needs", "name": "needs-60", "needs": false}
+{"kind": "needs", "name": "needs-61", "needs": false}
+{"kind": "needs", "name": "needs-62", "needs": true}
+{"kind": "needs", "name": "needs-63", "needs": false}
+{"kind": "needs", "name": "needs-64", "needs": false}
+{"kind": "needs", "name": "needs-65", "needs": true}
+{"kind": "needs", "name": "needs-66", "needs": true}

parity/oracle/subjects.py

@@ -0,0 +1,103 @@
+"""Apply a subject scheme the way the book pipeline did, for comparison.
+
+The four functions below are the originals, copied out of the subjects module
+verbatim and with the module-level scheme lifted into an argument — importing
+it opens a database connection and loads a chat client, and neither decides
+anything. What decides is the arithmetic of the scheme, which is what this
+compares.
+
+    python3 oracle/subjects.py < cases.ndjson
+
+One case per line, carrying its own scheme. Writes one JSON answer per line.
+"""
+
+from __future__ import annotations
+
+import json
+import re
+import sys
+
+_STUDY_TITLE_RE = re.compile(
+    r"\b(companion to|guidebook to|very short introduction|"
+    r"letters of|collected letters|memoirs?\b|autobiograph|"
+    r"\bdiary\b|\bessays\b|\blectures\b|\bspeeches\b|"
+    r"a life of|biography of)\b",
+    re.IGNORECASE,
+)
+
+
+def canonical_tag(name, scheme):
+    subject_lower = {s.lower(): s for s in scheme["subjects"]}
+    alias_lower = {k.lower(): v for k, v in scheme["aliases"].items()}
+    drop_lower = {d.lower().strip("*[]") for d in scheme["drop"]}
+    t = (name or "").strip()
+    if not t:
+        return None
+    low = t.lower()
+    if low in drop_lower or low.strip("*[]") in drop_lower:
+        return None
+    if low in subject_lower:
+        return subject_lower[low]
+    if low in alias_lower:
+        return alias_lower[low]
+    return None
+
+
+def expand_parents(subjects, scheme):
+    subject_set = frozenset(scheme["subjects"])
+    chosen = set()
+    for s in subjects:
+        if s not in subject_set:
+            continue
+        chosen.add(s)
+        parent = scheme["parents"].get(s)
+        if parent:
+            chosen.add(parent)
+    return [s for s in scheme["subjects"] if s in chosen]
+
+
+def sanitize_subjects(subjects, scheme, title=None):
+    blocks = frozenset(scheme["blocks_fiction"])
+    genres = frozenset(scheme["fiction_genres"])
+    chosen = set(subjects)
+    study = bool(title and _STUDY_TITLE_RE.search(title))
+    if chosen & blocks or study:
+        chosen -= genres
+    return [s for s in scheme["subjects"] if s in chosen]
+
+
+def compose_tags(subjects, scheme, title=None):
+    return sanitize_subjects(expand_parents(subjects, scheme), scheme, title=title)
+
+
+def needs_classify(existing, scheme):
+    subject_set = frozenset(scheme["subjects"])
+    for raw in existing:
+        c = canonical_tag(raw, scheme)
+        if c and c in subject_set:
+            return False
+    return True
+
+
+def answer(case):
+    scheme, kind = case["scheme"], case["kind"]
+    if kind == "canonical":
+        return {"subject": canonical_tag(case["tag"], scheme)}
+    if kind == "parents":
+        return {"subjects": expand_parents(case["subjects"], scheme)}
+    if kind == "fiction":
+        return {"subjects": sanitize_subjects(case["subjects"], scheme, title=case.get("title"))}
+    if kind == "compose":
+        return {"subjects": compose_tags(case["subjects"], scheme, title=case.get("title"))}
+    if kind == "needs":
+        return {"needs": needs_classify(case["existing"], scheme)}
+    raise SystemExit(f"no such case: {kind}")
+
+
+for line in sys.stdin:
+    if not line.strip():
+        continue
+    case = json.loads(line)
+    out = {"name": case["name"], "kind": case["kind"]}
+    out.update(answer(case))
+    sys.stdout.write(json.dumps(out, sort_keys=True) + "\n")

parity/src/bin/regen.rs

@@ -19,7 +19,7 @@ type Written = Result<Vec<String>, String>;
 type Job = (&'static str, fn() -> Written);
 
 fn main() -> ExitCode {
-    let jobs: [Job; 18] = [
+    let jobs: [Job; 19] = [
         ("tokens", tokens),
         ("unescape", unescape),
         ("chunkmd", chunkmd),
@@ -38,6 +38,7 @@ fn main() -> ExitCode {
         ("avplan", avplan),
         ("pdfgutter", pdfgutter),
         ("seriesof", seriesof),
+        ("subjects", subjects),
     ];
 
     for (name, job) in jobs {
@@ -220,6 +221,18 @@ fn cueseg() -> Written {
     Ok(written)
 }
 
+fn subjects() -> Written {
+    let dir = parity::golden("subjects");
+    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
+
+    let cases = parity::dir().join("cases/subjects/cases.ndjson");
+    let text = std::fs::read_to_string(&cases).map_err(|e| e.to_string())?;
+    let answers = parity::run_oracle("subjects.py", &text)?;
+    let path = dir.join("cases.ndjson");
+    std::fs::write(&path, answers).map_err(|e| e.to_string())?;
+    Ok(vec![path.display().to_string()])
+}
+
 fn seriesof() -> Written {
     let dir = parity::golden("seriesof");
     std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;

parity/tests/subjects.rs

@@ -0,0 +1,123 @@
+//! Every judgement a subject scheme makes must match the Python exactly.
+//!
+//! A scheme decides what a shelf can be browsed by. A heading mapped onto the
+//! wrong subject files a book where nobody will look for it, and a fiction
+//! genre left on a biography puts a life of somebody in among the novels.
+
+use bibclean::scheme::Scheme;
+use serde_json::Value;
+
+fn records(text: &str) -> Vec<Value> {
+    text.lines()
+        .filter(|line| !line.trim().is_empty())
+        .map(|line| serde_json::from_str(line).expect("valid JSON"))
+        .collect()
+}
+
+fn cases() -> Vec<Value> {
+    let text = std::fs::read_to_string(parity::dir().join("cases/subjects/cases.ndjson"))
+        .expect("a readable case file");
+    records(&text)
+}
+
+fn strings(value: &Value) -> Vec<String> {
+    value
+        .as_array()
+        .expect("an array")
+        .iter()
+        .map(|item| item.as_str().expect("a string").to_string())
+        .collect()
+}
+
+#[test]
+fn every_judgement_matches_python() {
+    let golden = records(&parity::read_golden_text("subjects/cases.ndjson"));
+    let cases = cases();
+    assert_eq!(cases.len(), golden.len(), "case count moved — regenerate");
+
+    let mut wrong: Vec<String> = Vec::new();
+    for (case, theirs) in cases.iter().zip(&golden) {
+        let name = case["name"].as_str().expect("a name");
+        let kind = case["kind"].as_str().expect("a kind");
+        assert_eq!(theirs["name"].as_str(), Some(name), "cases out of order");
+
+        // The scheme travels with the case, because a scheme is exactly the
+        // thing that is not compiled in.
+        let scheme: Scheme =
+            serde_json::from_value(case["scheme"].clone()).expect("a readable scheme");
+        let title = case["title"].as_str();
+
+        let mut note = |field: &str, ours: String, theirs: &Value| {
+            wrong.push(format!("{name}.{field}: python {theirs}, rust {ours}"));
+        };
+
+        match kind {
+            "canonical" => {
+                let ours = scheme.canonical(case["tag"].as_str().expect("a tag"));
+                if ours != theirs["subject"].as_str() {
+                    note("subject", format!("{ours:?}"), &theirs["subject"]);
+                }
+            }
+            "parents" => {
+                let ours = scheme.with_parents(&strings(&case["subjects"]));
+                if ours != strings(&theirs["subjects"]) {
+                    note("subjects", format!("{ours:?}"), &theirs["subjects"]);
+                }
+            }
+            "fiction" => {
+                let ours = scheme.without_impossible_fiction(&strings(&case["subjects"]), title);
+                if ours != strings(&theirs["subjects"]) {
+                    note("subjects", format!("{ours:?}"), &theirs["subjects"]);
+                }
+            }
+            "compose" => {
+                let ours = scheme.compose(&strings(&case["subjects"]), title);
+                if ours != strings(&theirs["subjects"]) {
+                    note("subjects", format!("{ours:?}"), &theirs["subjects"]);
+                }
+            }
+            "needs" => {
+                let ours = scheme.needs_subject(&strings(&case["existing"]));
+                if Some(ours) != theirs["needs"].as_bool() {
+                    note("needs", ours.to_string(), &theirs["needs"]);
+                }
+            }
+            other => panic!("nothing answers a {other} case"),
+        }
+    }
+
+    assert!(
+        wrong.is_empty(),
+        "{} judgements differ:\n{}",
+        wrong.len(),
+        wrong
+            .iter()
+            .take(20)
+            .map(|line| line.chars().take(200).collect::<String>())
+            .collect::<Vec<_>>()
+            .join("\n")
+    );
+}
+
+/// Every question has to be asked, or the file proves less than it looks like
+/// it does.
+#[test]
+fn every_kind_of_case_is_present() {
+    let cases = cases();
+    for kind in ["canonical", "parents", "fiction", "compose", "needs"] {
+        assert!(
+            cases.iter().any(|case| case["kind"] == kind),
+            "no {kind} case"
+        );
+    }
+}
+
+/// Catches a golden file drifting away from a Python that has moved on.
+#[test]
+#[cfg(feature = "python")]
+fn the_golden_file_still_matches_live_python() {
+    let cases = std::fs::read_to_string(parity::dir().join("cases/subjects/cases.ndjson"))
+        .expect("a readable case file");
+    let live = parity::run_oracle("subjects.py", &cases).expect("the oracle runs");
+    assert_eq!(live, parity::read_golden_text("subjects/cases.ndjson"));
+}