diff --git a/.gitignore b/.gitignore
index 6283cb2..b12a09f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -257,3 +257,4 @@ paket-files/
 /TestResult.txt
 
 /.claude/settings.local.json
+/.claude/agent-memory-local/
diff --git a/CLAUDE.md b/CLAUDE.md
index 2c7c8ad..53142b8 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -12,7 +12,19 @@ requirements-interchange documents. The repository ships two NuGet packages:
   `ReqIFLoaderService`, built on top of the core. Targets `netstandard2.0`.
 
 The two packages version independently (e.g. ReqIFSharp `10.x`, ReqIFSharp.Extensions `5.x`).
-Test projects target `net10.0` and use NUnit. `LangVersion` is pinned to `12.0`.
+Test projects target `net10.0` and use NUnit. `LangVersion` is pinned to `14.0` (in `Directory.Build.props`).
+Building requires the .NET 10 SDK (`global.json`, rolls forward to the latest 10.0 feature band).
+
+**MSBuild layout.** `Directory.Build.props` holds settings for every project (company,
+copyright, repository, `LangVersion`, `GenerateDocumentationFile`). Packaging settings shared
+by the published libraries (package metadata, README/LICENSE/NOTICE pack items, the
+`Microsoft.Sbom.Targets` reference) live in `Directory.Build.targets`, guarded by
+`'$(IsPackable)' != 'false'`; it must be a `.targets` file because `IsPackable` is set in the
+project body, after `.props` is evaluated. `GenerateDocumentationFile` cannot move there: the
+SDK derives the documentation-file settings from it before `.targets` is evaluated. Test
+projects therefore set both `<IsPackable>false</IsPackable>` and
+`<GenerateDocumentationFile>false</GenerateDocumentationFile>`. The library `.csproj` files keep
+only per-package settings (version, title, description, id, icon, authors, release notes).
 
 ## Common commands
 
diff --git a/Directory.Build.props b/Directory.Build.props
index 7a61dfe..8867e0f 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -8,6 +8,12 @@
         <Deterministic>true</Deterministic>
         <NeutralLanguage>en-US</NeutralLanguage>
         <SatelliteResourceLanguages>en-US</SatelliteResourceLanguages>
+        <LangVersion>14.0</LangVersion>
+        <!--
+            Set here rather than in Directory.Build.targets: the SDK turns it into the documentation
+            file settings before Directory.Build.targets is evaluated. Test projects switch it off.
+        -->
+        <GenerateDocumentationFile>true</GenerateDocumentationFile>
     </PropertyGroup>
 
 </Project>
diff --git a/Directory.Build.targets b/Directory.Build.targets
new file mode 100644
index 0000000..a4a1782
--- /dev/null
+++ b/Directory.Build.targets
@@ -0,0 +1,27 @@
+<Project>
+
+    <!--
+        Packaging settings shared by every packable project. They live in this file rather than in
+        Directory.Build.props because IsPackable is set in the project file itself, which is evaluated
+        after Directory.Build.props and before this file.
+    -->
+    <PropertyGroup Condition="'$(IsPackable)' != 'false'">
+        <PackageProjectUrl>https://reqifsharp.org</PackageProjectUrl>
+        <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
+        <PackageTags>ReqIF mbse modeltopia</PackageTags>
+        <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
+        <RequireLicenseAcceptance>false</RequireLicenseAcceptance>
+        <IncludeSource>true</IncludeSource>
+        <IncludeSymbols>true</IncludeSymbols>
+        <GenerateSBOM>true</GenerateSBOM>
+        <PackageReadmeFile>README.md</PackageReadmeFile>
+    </PropertyGroup>
+
+    <ItemGroup Condition="'$(IsPackable)' != 'false'">
+        <None Include="$(MSBuildThisFileDirectory)README.md" Pack="true" PackagePath="\" />
+        <None Include="$(MSBuildThisFileDirectory)LICENSE" Pack="true" PackagePath="\" />
+        <None Include="$(MSBuildThisFileDirectory)NOTICE" Pack="true" PackagePath="\" />
+        <PackageReference Include="Microsoft.Sbom.Targets" PrivateAssets="all" />
+    </ItemGroup>
+
+</Project>
diff --git a/ReqIFSharp.Extensions.Tests/ReqIFSharp.Extensions.Tests.csproj b/ReqIFSharp.Extensions.Tests/ReqIFSharp.Extensions.Tests.csproj
index b405466..c3d862a 100644
--- a/ReqIFSharp.Extensions.Tests/ReqIFSharp.Extensions.Tests.csproj
+++ b/ReqIFSharp.Extensions.Tests/ReqIFSharp.Extensions.Tests.csproj
@@ -6,6 +6,7 @@
         <Description>Nunit test suite for the ReqIFSharp.Extensions library</Description>
         <Nullable>disable</Nullable>
         <IsPackable>false</IsPackable>
+        <GenerateDocumentationFile>false</GenerateDocumentationFile>
     </PropertyGroup>
 
     <ItemGroup>
diff --git a/ReqIFSharp.Extensions/ReqIFSharp.Extensions.csproj b/ReqIFSharp.Extensions/ReqIFSharp.Extensions.csproj
index eac55d7..89ec697 100644
--- a/ReqIFSharp.Extensions/ReqIFSharp.Extensions.csproj
+++ b/ReqIFSharp.Extensions/ReqIFSharp.Extensions.csproj
@@ -3,25 +3,14 @@
   <PropertyGroup>
       <TargetFramework>netstandard2.0</TargetFramework>
       <Version>5.2.1</Version>
-      <LangVersion>12.0</LangVersion>
       <Title>ReqIFSharp.Extensions</Title>
       <Description>A .NET library that provides extenions and services to operate on ReqIF documents.</Description>
       <PackageId>ReqIFSharp.Extensions</PackageId>
-      <PackageProjectUrl>https://reqifsharp.org</PackageProjectUrl>
-      <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
       <PackageIcon>reqifsharp-extensions-logo-small.png</PackageIcon>
-      <PackageTags>ReqIF mbse modeltopia</PackageTags>
-      <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
       <Authors>Sam Gerené</Authors>
-      <RequireLicenseAcceptance>false</RequireLicenseAcceptance>
-      <IncludeSource>true</IncludeSource>
-      <IncludeSymbols>true</IncludeSymbols>
-      <GenerateDocumentationFile>true</GenerateDocumentationFile>
-      <GenerateSBOM>true</GenerateSBOM>
       <PackageReleaseNotes>
           - [Update] to reqifsharp version 10.1.1
       </PackageReleaseNotes>
-      <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
   <ItemGroup>
@@ -34,13 +23,6 @@
 
   <ItemGroup>
     <None Include="..\reqifsharp-extensions-logo-small.png" Pack="true" PackagePath="" />
-    <None Include="..\README.md" Pack="true" PackagePath="\" />
-    <None Include="..\LICENSE" Pack="true" PackagePath="\" />
-    <None Include="..\NOTICE" Pack="true" PackagePath="\" />
   </ItemGroup>
 
-    <ItemGroup>
-        <PackageReference Include="Microsoft.Sbom.Targets" PrivateAssets="all" />
-    </ItemGroup>
-
 </Project>
diff --git a/ReqIFSharp.Tests/ReqIFSharp.Tests.csproj b/ReqIFSharp.Tests/ReqIFSharp.Tests.csproj
index 695fe95..3bd0dc6 100644
--- a/ReqIFSharp.Tests/ReqIFSharp.Tests.csproj
+++ b/ReqIFSharp.Tests/ReqIFSharp.Tests.csproj
@@ -7,6 +7,7 @@
         <Description>Nunit test suite for the ReqIFSharp library</Description>
         <Nullable>disable</Nullable>
         <IsPackable>false</IsPackable>
+        <GenerateDocumentationFile>false</GenerateDocumentationFile>
     </PropertyGroup>
 
     <ItemGroup>
diff --git a/ReqIFSharp/ReqIFSharp.csproj b/ReqIFSharp/ReqIFSharp.csproj
index 5c24473..4712378 100644
--- a/ReqIFSharp/ReqIFSharp.csproj
+++ b/ReqIFSharp/ReqIFSharp.csproj
@@ -5,25 +5,14 @@
     <PropertyGroup>
         <TargetFramework>netstandard2.0</TargetFramework>
         <Version>10.1.1</Version>
-        <LangVersion>12.0</LangVersion>
         <Title>ReqIFSharp</Title>
         <Description>A .NET library to deserialize (read) and serialize (write) OMG ReqIF documents.</Description>
         <PackageId>ReqIFSharp</PackageId>
-        <PackageProjectUrl>https://reqifsharp.org</PackageProjectUrl>
-        <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
         <PackageIcon>reqifsharp-logo-small.png</PackageIcon>
-        <PackageTags>ReqIF mbse modeltopia</PackageTags>
-        <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
         <Authors>Sam Gerené, Alexander van Delft</Authors>
-        <RequireLicenseAcceptance>false</RequireLicenseAcceptance>
-        <IncludeSource>true</IncludeSource>
-        <IncludeSymbols>true</IncludeSymbols>
-        <GenerateDocumentationFile>true</GenerateDocumentationFile>
-        <GenerateSBOM>true</GenerateSBOM>
         <PackageReleaseNotes>
             - [Update] dependencies
         </PackageReleaseNotes>
-        <PackageReadmeFile>README.md</PackageReadmeFile>
     </PropertyGroup>
 
     <ItemGroup>
@@ -76,9 +65,6 @@
 
     <ItemGroup>
         <None Include="..\reqifsharp-logo-small.png" Pack="true" PackagePath="" />
-        <None Include="..\README.md" Pack="true" PackagePath="\" />
-        <None Include="..\LICENSE" Pack="true" PackagePath="\" />
-        <None Include="..\NOTICE" Pack="true" PackagePath="\" />
     </ItemGroup>
 
     <ItemGroup>
@@ -92,7 +78,6 @@
             API need. The floor itself is set in Directory.Packages.props.
         -->
         <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" />
-        <PackageReference Include="Microsoft.Sbom.Targets" PrivateAssets="all" />
     </ItemGroup>
 
 </Project>
\ No newline at end of file
diff --git a/global.json b/global.json
new file mode 100644
index 0000000..512142d
--- /dev/null
+++ b/global.json
@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "version": "10.0.100",
+    "rollForward": "latestFeature"
+  }
+}