Update DCAB dataset to v0.5.0

README.md

@@ -17,7 +17,7 @@ size_categories:
 
 # Document Change Assurance Benchmark (DCAB)
 
-This dataset mirrors the deterministic fixture corpus from [DCAB v0.4.0](https://github.com/SybilGambleyyu/document-change-benchmark/tree/v0.4.0). It contains 15 paired synthetic WordprocessingML cases for static document-change assurance.
+This dataset mirrors the deterministic fixture corpus from [DCAB v0.5.0](https://github.com/SybilGambleyyu/document-change-benchmark/tree/v0.5.0). It contains 16 paired synthetic WordprocessingML cases for static document-change assurance.
 
 Each case directory provides a baseline package, candidate package, and target-free `truth.json`. The public truth files describe only a narrow fact category and a reference review convention. They never disclose URI-like targets, field instructions, XPath values, relationship IDs, custom XML values, or opaque payload bytes.
 
@@ -33,7 +33,7 @@ fixtures/
   ...
 ```
 
-The corpus covers direct Word hyperlinks, `HYPERLINK` and `INCLUDETEXT` fields, attached-template, master-subdocument, and DrawingML linked-picture relationships, hidden text, tracked insertion markup, Track Changes and document protection settings, content-control/custom-XML bindings, VBA project payload boundaries, and embedded OLE payload boundaries.
+The corpus covers direct Word hyperlinks, `HYPERLINK` and `INCLUDETEXT` fields, attached-template, master-subdocument, and DrawingML linked-picture relationships, alternative-format import payloads, hidden text, tracked insertion markup, Track Changes and document protection settings, content-control/custom-XML bindings, VBA project payload boundaries, and embedded OLE payload boundaries.
 
 ## Safety boundary
 
@@ -52,4 +52,4 @@ This mirror has no special execution requirement. It is provided under the MIT l
 
 ## Scope
 
-DCAB does not claim client rendering/runtime compatibility or universal security policy. It is a narrow, tool-neutral static-review benchmark. See the [repository README](https://github.com/SybilGambleyyu/document-change-benchmark) and [research notes](https://github.com/SybilGambleyyu/document-change-benchmark/blob/v0.4.0/RESEARCH.md) for contract details and limits.
+DCAB does not claim client rendering/runtime compatibility or universal security policy. It is a narrow, tool-neutral static-review benchmark. See the [repository README](https://github.com/SybilGambleyyu/document-change-benchmark) and [research notes](https://github.com/SybilGambleyyu/document-change-benchmark/blob/v0.5.0/RESEARCH.md) for contract details and limits.

RESEARCH.md

@@ -16,6 +16,7 @@ None of that implies absence of other relevant work. It identifies a concrete in
 - An [`attachedTemplate` relationship](https://learn.microsoft.com/en-us/openspecs/office_standards/ms-oe376/7713efa6-b1ff-4cbd-9339-5bf9018433ac) supplies the attached template path for a Word settings anchor. DCAB keeps the anchor and relationship ID stable while changing only that external relationship's synthetic target.
 - A [`w:subDoc`](https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.wordprocessing.subdocumentreference?view=openxml-3.0.1) identifies a master-document subdocument location. Its relationship is a separately stored external document dependency, so DCAB keeps the anchor and relationship ID stable while changing only the synthetic target.
 - A DrawingML [`a:blip` `r:link`](https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.drawing.blip.link?view=openxml-3.0.1) identifies a linked picture that does not reside in the file. DCAB keeps that marker and its external image relationship type stable while changing only the synthetic relationship target.
+- A [`w:altChunk`](https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.wordprocessing.altchunk?view=openxml-3.0.1) anchor identifies alternate content for import through an internal `afChunk` relationship. DCAB keeps the anchor and relationship fixed while changing only an inert HTML payload, and never parses or imports it.
 - [Word content controls](https://learn.microsoft.com/en-us/visualstudio/vsto/content-controls?view=visualstudio) can bind content controls to embedded custom XML parts. [Microsoft's binding walkthrough](https://learn.microsoft.com/en-us/visualstudio/vsto/walkthrough-binding-content-controls-to-custom-xml-parts?view=visualstudio) explains that mapped values can display when a document opens.
 - [`w:vanish`](https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.wordprocessing.vanish?view=openxml-3.0.1) and [`w:ins`](https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.wordprocessing.insertedrun?view=openxml-3.0.1) are explicit WordprocessingML markup classes.
 - [`w:documentProtection`](https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.wordprocessing.documentprotection?view=openxml-3.0.1) records editing restrictions but is documented as not being a security feature; DCAB therefore models only a password-free declaration and makes no security claim.

fixtures/import.alternative_format_html_payload_changed/truth.json

@@ -0,0 +1,22 @@
+{
+  "baseline": "baseline.docx",
+  "candidate": "candidate.docx",
+  "coverage_expectations": [],
+  "description": "A w:altChunk anchor and internal afChunk relationship retain their shape while the synthetic HTML import payload changes.",
+  "facts": [
+    {
+      "kind": "alternative_format_import_payload_changed",
+      "payload_kind": "html",
+      "source": "word_alt_chunk"
+    }
+  ],
+  "id": "import.alternative_format_html_payload_changed",
+  "invariants": {
+    "changed_member_count": 1,
+    "package_member_set_stable": true,
+    "stored_text_stable": true
+  },
+  "review_expectation": "block",
+  "schema_version": 1,
+  "title": "Alternative-format HTML import payload changed"
+}

fixtures/manifest.jsonl

@@ -5,6 +5,7 @@
 {"id": "external.attached_template_target_retargeted", "schema_version": 1, "truth": "external.attached_template_target_retargeted/truth.json"}
 {"id": "external.subdocument_target_retargeted", "schema_version": 1, "truth": "external.subdocument_target_retargeted/truth.json"}
 {"id": "external.drawing_linked_picture_target_retargeted", "schema_version": 1, "truth": "external.drawing_linked_picture_target_retargeted/truth.json"}
+{"id": "import.alternative_format_html_payload_changed", "schema_version": 1, "truth": "import.alternative_format_html_payload_changed/truth.json"}
 {"id": "review.hidden_text_run_added", "schema_version": 1, "truth": "review.hidden_text_run_added/truth.json"}
 {"id": "review.tracked_insertion_markup_added", "schema_version": 1, "truth": "review.tracked_insertion_markup_added/truth.json"}
 {"id": "review.track_revisions_setting_enabled", "schema_version": 1, "truth": "review.track_revisions_setting_enabled/truth.json"}