Rename Vietnamese-stemmed columns to English

Breaking change in documents-*.parquet schema:
* so_hieu -> doc_number (list<string>)
* ngay_ban_hanh -> issue_date (string, ISO YYYY-MM-DD)
* co_quan_ban_hanh -> issuing_body (string)
* trich_yeu -> summary (string)

Consumers reading these columns by name need to update.
The aligned anle.toaan.gov.vn/documents columns (issue_date,
issuing_body) keep their existing names so cross-site joins
work without aliasing.

Vietnamese values inside the columns are unchanged.

README.md

@@ -144,7 +144,7 @@ full Vietnamese name via
 [`slugify_vi`](https://github.com/tmquan/ViLA/blob/main/packages/datasites/vbpl/codes.py)
 so a reader can interpret the doc type without consulting a separate
 codebook. The compact short code (`QĐ`, `NĐ`, `TTLT`, ...) still
-appears inside `so_hieu` itself (`43/2026/NĐ-CP`) and can be
+appears inside `doc_number` itself (`43/2026/NĐ-CP`) and can be
 recovered from any slug via the `SLUG_TO_CANONICAL_CODE` table in
 `codes.py`. The set of slugs follows Luật Ban hành Văn bản Quy phạm
 Pháp luật 2015 — `hien_phap` / `bo_luat` / `luat` / `phap_lenh` /
@@ -245,9 +245,9 @@ chia khá đều phần `dia_phuong`.
 
 ## Năm ban hành · Year of issue
 
-Phân bố năm theo `ngay_ban_hanh` (ISO `YYYY-MM-DD`); rỗng nếu cổng
+Phân bố năm theo `issue_date` (ISO `YYYY-MM-DD`); rỗng nếu cổng
 không cung cấp được trường này. — Year distribution from
-`ngay_ban_hanh`; null when the source portal didn't expose the issue
+`issue_date`; null when the source portal didn't expose the issue
 date.
 
 | Year | Count |
@@ -312,20 +312,20 @@ The parquet has three families of columns:
 | `source` | string | Source host, always `vbpl.vn`. |
 | `source_url` / `api_url` | string | Deep link back to the portal page / the underlying gateway API. |
 | `title` | string (nullable) | Document subject after the full title scrub: (1) baseline cleanup (NFC, HTML-entity decode, `"số số"` doubling fix, trailing sentence punctuation), (2) decorative quote stripping at the title boundary and around inline phrases — leading / trailing / paired runs of `"`, `'`, `"`, `'`, `'`, `'` are removed but **word-internal single quotes are preserved** so legitimate Vietnamese / loan-word names survive intact (`Đắk R'lấp`, `M'nông`, `D'Ran`, `Côte d'Ivoire`, `Ea T'ling`, `Đạ M'ri`, …), (3) leading `"<Legal-type> số <Number> "` boilerplate head peeled (e.g. `"Quyết định số 143/QĐ-KHTC Ban hành Quy chế"` → `"Ban hành Quy chế"`), and (4) every `"<DocType> [số] <DocNum> [ngày <date>]"` cross-reference of OTHER documents stripped from anywhere in the body (`"Bãi bỏ Nghị quyết số 84/2018/NQ-HĐND ngày 07/12/2018 của HĐND tỉnh..."` → `"Bãi bỏ của HĐND tỉnh..."`). The Vietnamese noun `Lỗi` / `lỗi` / `loi` ("fault / error") is preserved wherever it appears — it's a legitimate subject word (e.g. `"Lỗi Ban hành Quy chế hoạt động của hội đồng tư vấn mua sắm tài sản"`), not a CMS marker. `null` for the pathological tail where the entire source title was just a bare doc-num token (e.g. `"1938/QĐ-UBND"`); other bibliographic columns still carry the citation handle. |
-| `doc_type` | string | Self-describing **ASCII snake_case slug** of the Vietnamese doc-type name (`quyet_dinh`, `nghi_dinh`, `thong_tu_lien_tich`, `chi_thi`, `van_ban_hop_nhat`, ...). Auto-derived from `legal_type` via `slugify_vi`; the compact short code (`QĐ`, `NĐ`, `TTLT`, ...) still appears in `so_hieu` itself (`43/2026/NĐ-CP`) and is recoverable via `SLUG_TO_CANONICAL_CODE`. |
+| `doc_type` | string | Self-describing **ASCII snake_case slug** of the Vietnamese doc-type name (`quyet_dinh`, `nghi_dinh`, `thong_tu_lien_tich`, `chi_thi`, `van_ban_hop_nhat`, ...). Auto-derived from `legal_type` via `slugify_vi`; the compact short code (`QĐ`, `NĐ`, `TTLT`, ...) still appears in `doc_number` itself (`43/2026/NĐ-CP`) and is recoverable via `SLUG_TO_CANONICAL_CODE`. |
 | `legal_type` | string | Canonical Vietnamese **full name** for the document type (`Luật`, `Nghị định`, `Thông tư`, `Quyết định`, `Nghị quyết`, `Chỉ thị`, …). Round-trips with `doc_type` via `slugify_vi`. |
 | `legal_area` | string | Legal area / subject domain (`Đất đai`, `Đường bộ`, `Lĩnh vực giá`, …). Defaults to `Chưa phân loại` when the source portal hasn't tagged the doc. |
-| `so_hieu` | list&lt;string&gt; (nullable) | Document number(s) as a list of canonical short forms (e.g. `["43/2026/NĐ-CP"]`). A small minority of vbpl rows pack several identifiers into one source cell separated by Vietnamese ` và ` ("and") or `,`; those ship as multi-element lists (e.g. `["142/2009/QĐ-TTg", "49/2012/QĐ-TTg"]`). Source-side cruft is stripped: leading legal-type words (`"Nghị quyết số: 528/2018/UBTVQH14"` → `["528/2018/UBTVQH14"]`), trailing annotations (`"109/2005/QĐ-BCA (A11)"` → `["109/2005/QĐ-BCA"]`, `"49/2007/TTLT-BTC-BGD ngày 18/5/2007"` → `["49/2007/TTLT-BTC-BGD"]`), and the legitimate `"Không số"` ("no number") sentinel is preserved. `null` for rows with no usable number. |
-| `ngay_ban_hanh` | string | Issue date, ISO `YYYY-MM-DD`. |
-| `year` | int32 | Year extracted from `ngay_ban_hanh`. |
-| `co_quan_ban_hanh` | string | Issuing agency (e.g. `"Chính phủ"`, `"Bộ Tài chính"`, `"Hội đồng nhân dân tỉnh A"`). |
-| `trich_yeu` | string | Abstract / summary. |
+| `doc_number` | list&lt;string&gt; (nullable) | Document number(s) as a list of canonical short forms (e.g. `["43/2026/NĐ-CP"]`). A small minority of vbpl rows pack several identifiers into one source cell separated by Vietnamese ` và ` ("and") or `,`; those ship as multi-element lists (e.g. `["142/2009/QĐ-TTg", "49/2012/QĐ-TTg"]`). Source-side cruft is stripped: leading legal-type words (`"Nghị quyết số: 528/2018/UBTVQH14"` → `["528/2018/UBTVQH14"]`), trailing annotations (`"109/2005/QĐ-BCA (A11)"` → `["109/2005/QĐ-BCA"]`, `"49/2007/TTLT-BTC-BGD ngày 18/5/2007"` → `["49/2007/TTLT-BTC-BGD"]`), and the legitimate `"Không số"` ("no number") sentinel is preserved. `null` for rows with no usable number. |
+| `issue_date` | string | Issue date, ISO `YYYY-MM-DD`. |
+| `year` | int32 | Year extracted from `issue_date`. |
+| `issuing_body` | string | Issuing agency (e.g. `"Chính phủ"`, `"Bộ Tài chính"`, `"Hội đồng nhân dân tỉnh A"`). |
+| `summary` | string | Abstract / summary. |
 
 ### Body + stats
 
 | Field | Type | Description |
 |---|---|---|
-| `markdown` | string (nullable) | NFC-normalised, modern-orthography Vietnamese markdown (page-segmented with `## Page N` headings when parsed from a PDF). Gateway / Word / Next.js scaffolding is stripped: the `Document Content\\n\\nbody { font-family: ... }\\np { margin: ... }` API preamble (~50 % of bodies), Word `<!-- /* Font Definitions */ @font-face { ... } p.MsoNormal { ... } -->` stylesheet dumps, standalone CSS rule blocks gated by property / selector / structural CSS tells, Ant Design `:where(.css-...){ ... }@keyframes ...{ ... }` chains, orphan selector fragments, and malformed inline `<span lang="..." style="...">` tags. ~90 % of rows lose 1-200 KB of boilerplate; total corpus markdown shrunk by ~1.77 GB / 42 %. **Null** when `body_source == "shell_html"` after the May-2026 live-API recovery (the source genuinely has no body for those legacy IDs); bibliographic metadata (title, agency, so_hieu, ...) is still populated on NULL-markdown rows so consumers retain the citation handle. |
+| `markdown` | string (nullable) | NFC-normalised, modern-orthography Vietnamese markdown (page-segmented with `## Page N` headings when parsed from a PDF). Gateway / Word / Next.js scaffolding is stripped: the `Document Content\\n\\nbody { font-family: ... }\\np { margin: ... }` API preamble (~50 % of bodies), Word `<!-- /* Font Definitions */ @font-face { ... } p.MsoNormal { ... } -->` stylesheet dumps, standalone CSS rule blocks gated by property / selector / structural CSS tells, Ant Design `:where(.css-...){ ... }@keyframes ...{ ... }` chains, orphan selector fragments, and malformed inline `<span lang="..." style="...">` tags. ~90 % of rows lose 1-200 KB of boilerplate; total corpus markdown shrunk by ~1.77 GB / 42 %. **Null** when `body_source == "shell_html"` after the May-2026 live-API recovery (the source genuinely has no body for those legacy IDs); bibliographic metadata (title, agency, doc_number, ...) is still populated on NULL-markdown rows so consumers retain the citation handle. |
 | `num_pages` | int32 | Page count from the parser (PDF/DOCX only). |
 | `num_sections` / `num_paragraphs` / `num_sentences` | int32 | Counts from the structure layer. |
 | `char_len` | int32 | Character length of `markdown` **after** the junk-strip pass (recomputed at export time so consumers can dedupe on the actual shipped body). |
@@ -351,12 +351,12 @@ from datasets import load_dataset
 
 ds = load_dataset("tmquan/vbpl-vn", split="train")
 row = ds[0]
-print(row["doc_type"], row["so_hieu"], row["ngay_ban_hanh"])
+print(row["doc_type"], row["doc_number"], row["issue_date"])
 # e.g. "quyet_dinh 143/QĐ-KHTC 2018-01-29"
 print(row["title"])
 # e.g. "Ban hành Quy chế quản lý ngân sách ngành Tư pháp"
 # (the redundant "Quyết định số 143/QĐ-KHTC " head has been
-#  stripped; recombine via f"{row['legal_type']} số {row['so_hieu']} {row['title']}"
+#  stripped; recombine via f"{row['legal_type']} số {row['doc_number']} {row['title']}"
 #  if your downstream pipeline still wants the full original.)
 structure = json.loads(row["structure_json"])
 for sec in structure.get("sections", []):

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