From 444090d4820bbc8863b429f39dcbc32ab4e86856 Mon Sep 17 00:00:00 2001
From: mahach666 <79989386+mahach666@users.noreply.github.com>
Date: Thu, 12 Nov 2026 13:26:54 +0300
Subject: [PATCH] Document which extras are frozen

---
 .github/dependabot.yml | 10 ++++++++++
 CHANGELOG.md           |  1 +
 README.md              | 11 +++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 .github/dependabot.yml

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..a846233
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: nuget
+    directory: /
+    schedule:
+      interval: weekly
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 11e60ac..92dacd1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@ All notable changes to the `IfcIO` library are documented in this file.
 - `IfcElement.Solid`, `RevolvedSolid` and `BooleanResult` of read elements still describe the first body item in its own coordinates (only the `Mesh` is world-placed). Writing a read model back therefore still places those solids without the element placement, as before.
 - Malformed placement data (a `PlacementRelTo` cycle, an `IfcMappedItem` cycle or mapping nested deeper than 64 levels) makes `IfcModel.Open` throw `InvalidDataException`. So does geometry that expands to more than 1,000,000 + 256 vertices per STEP entity, which guards against nested `IfcMappedItem` amplification.
 - For length units without an `IfcLengthUnit` value, only geometry and storey elevations are converted to metres; quantities and property values stay in file units. Such elements get no `Solid` / `RevolvedSolid` / `BooleanResult` (those would stay in file units), so saving writes the metre `Mesh`.
+- **Documentation**: the README lists the frozen extras (HTML viewer, GLB/OBJ export, clash, measure, grids, diff, BCF), which get bug fixes only, and their planned replacements.
 
 ## [0.10.0] - 2026-11-11
 
diff --git a/README.md b/README.md
index 9e0f49b..f46e5b3 100644
--- a/README.md
+++ b/README.md
@@ -144,6 +144,17 @@ Reads and writes ISO 10303-21 STEP physical files conforming to **IFC2x3 Coordin
 - IFC5 (USD/JSON) is not yet supported.
 - Boolean mesh cutting evaluates planar CSG half-spaces; non-planar curved intersections are tessellated.
 
+## Scope and frozen features
+
+IfcIO reads and writes IFC. The following extras are frozen: they get bug fixes only, no new features or options.
+
+- HTML viewer (`IfcHtmlViewerExporter`, `ifcio view`). Viewing will move to [IOViewer](https://github.com/IOExtend/IOViewer) through a planned `IfcIO.Scene` adapter over the shared, planned `IOScene` model.
+- GLB and OBJ export (`IfcGlbExporter`, `IfcObjExporter`). A shared GLB writer is planned in `IOScene.Formats`.
+- Clash detection, measure, grids, diff, and BCF archives (`IfcClashDetector`, `IfcClashGrouper`, `IfcMeasureEngine`, `IfcGridSystem`, `IfcDiffEngine`, `BcfArchive`, `BcfZipExporter`). These will move to a planned `IOCoord` package.
+- IFC work-schedule (4D) sequence logic. It stays in IfcIO.
+
+None of these packages is published yet. The frozen features stay available and are removed no earlier than IfcIO 1.0, and only after a published replacement exists.
+
 ## Build from source and tests
 
 Use the .NET SDK selected by `global.json`, which specifies 10.0.100 with `latestFeature` roll-forward.