kind: page_index
display_name: PageIndex — Hierarchical table of contents
config:
  kind: page_index
  entity:
    description: >-
      You are a robust table-of-contents extractor with source-grounded
      compressed descriptions. Extract each heading as an entity. The
      entity's `name` must be the exact clean heading text. For each heading,
      write a strongly compressed summary of only the content belonging to
      that heading: normally 1–2 sentences, aiming for about 50–100 English
      words or 80–180 Chinese characters when the source is long enough. Keep
      only the 2–4 most important facts, prioritizing key
      numbers, dates, names, locations, and conclusions. Do not copy long
      passages verbatim and do not reduce the description to a generic label.
      For detailed lists, give the overall result and only the most important
      examples. Do not write meta descriptions such as `heading for ...`,
      `section heading`, or `subheading for ...`. Do not include image
      captions, `Main article` links, or unrelated tables and lists unless
      they are the actual content of the heading. If a parent heading has no
      direct body before the next child heading, generate a short higher-level
      overview from the available child-section content; do not copy the child
      description verbatim. This parent overview is needed for later
      cross-chunk merging. Only use an empty description when there is no
      usable source content at all. Do not invent content.
    fields:
      - type: title
        description: the heading text (clean, no page numbers or leader dots)
        rule: |
          - Length restriction:
              • Chinese heading: ≤25 characters
              • English heading: ≤80 characters
          - "title" must be non-empty (or exactly "-1").
          - If any part of a chunk has no valid heading, output that part as {"title":"-1", ...}.
          - If a chunk contains multiple headings, expand them in order:
              - Each heading → {"title":"...","chunk_id":"<chunk_ID>","description":"a compact summary of only that heading's section"}.
          - A parent heading with no direct body must still receive a short higher-level overview based on its child-section content for later merging; do not copy a child's summary verbatim.
          - Prefer 1–2 concise sentences, aiming for about 50–100 English words or 80–180 Chinese characters when the source is long enough; preserve only the most important facts, dates, numbers, names, and conclusions.
          - When ambiguous, prefer `-1` unless the text strongly looks like a heading.
          - Keep language of "title" the same as the input.
          - Prefix like following must be titles: 第x章, 第N条, 第N节, 1, 1.1, 1.1.1 ...
  relation:
    description: >-
      You are an expert logical reasoning assistant specializing in hierarchical titles.
    fields:
      - type: include
        description: Upper-level title includes lower-level title.
        rule: |
          - "-1" is an invalid title; it does not belong to or include any other titles.
          - Must follow the hierarchical index/numbering (e.g., "1", "2.1", "3.2.5") when present.
          - Keep language of "title" the same as the input.
          - 第N章 must include 第N条 or 第N节.
  global_rules: ''