Remove check for known extension prefixes

ISSUES.md

@@ -72,7 +72,6 @@
 |SKIN_SKELETON_INVALID|Skeleton node is not a common root.|Error|
 |UNKNOWN_ASSET_MAJOR_VERSION|Unknown glTF major asset version: `%1`.|Error|
 |UNKNOWN_ASSET_MINOR_VERSION|Unknown glTF minor asset version: `%1`.|Warning|
-|UNRESERVED_EXTENSION_PREFIX|Extension uses unreserved extension prefix '`%1`'.|Warning|
 |UNUSED_EXTENSION_REQUIRED|Unused extension '`%1`' cannot be required.|Error|
 ## LinkError
 | Code | Message | Severity |

lib/src/context.dart

@@ -167,9 +167,6 @@ class Context {
       if (prefix == null) {
         addIssue(SemanticError.invalidExtensionNameFormat,
             name: '/$EXTENSIONS_USED/$i');
-      } else if (!kReservedPrefixes.contains(prefix)) {
-        addIssue(SemanticError.unreservedExtensionPrefix,
-            name: '/$EXTENSIONS_USED/$i', args: [prefix]);
       }
 
       final extension = _userExtensions.firstWhere(

lib/src/errors.dart

@@ -433,11 +433,6 @@ class SemanticError extends IssueType {
       'NON_REQUIRED_EXTENSION',
       (args) => 'Extension ${_q(args[0])} cannot be optional.');
 
-  static final SemanticError unreservedExtensionPrefix = SemanticError._(
-      'UNRESERVED_EXTENSION_PREFIX',
-      (args) => 'Extension uses unreserved extension prefix ${_q(args[0])}.',
-      Severity.Warning);
-
   static final SemanticError invalidExtensionNameFormat = SemanticError._(
       'INVALID_EXTENSION_NAME_FORMAT',
       (args) => 'Extension name has invalid format.',

lib/src/ext/extensions.dart

@@ -113,71 +113,3 @@ const List<Extension> kDefaultExtensions = <Extension>[
   khrMeshQuantizationExtension,
   khrTextureTransformExtension
 ];
-
-// https://github.com/KhronosGroup/glTF/blob/main/extensions/Prefixes.md
-const Set<String> kReservedPrefixes = <String>{
-  'KHR',
-  'EXT',
-  'ADOBE',
-  'AGI',
-  'AGT',
-  'ALCM',
-  'ALI',
-  'AMZN',
-  'ANIMECH',
-  'ASOBO',
-  'AVR',
-  'BLENDER',
-  'CAPTURE',
-  'CESIUM',
-  'CITRUS',
-  'CLO',
-  'CVTOOLS',
-  'DOTV',
-  'EMBARK',
-  'EPIC',
-  'ESSILORLUXOTTICA',
-  'F8',
-  'FB',
-  'FOXIT',
-  'GOOGLE',
-  'GRIFFEL',
-  'HEVOLUS',
-  'INTEL',
-  'KDAB',
-  'LLQ',
-  'MAXAR',
-  'MESHOPT',
-  'MOZ',
-  'MPEG',
-  'MSFT',
-  'MTTR',
-  'MX',
-  'NEEDLE',
-  'NTAR',
-  'NV',
-  'OFT',
-  'OMI',
-  'OTOY',
-  'OWLII',
-  'PANDA3D',
-  'POLUTROPON',
-  'PTC',
-  'S8S',
-  'SE',
-  'SEIN',
-  'SHAPEDIVER',
-  'SI',
-  'SKFB',
-  'SKYLINE',
-  'SNAP',
-  'SPECTRUM',
-  'TENCENT',
-  'TRYON',
-  'UNITY',
-  'USSF',
-  'UX3D',
-  'VRMC',
-  'VSEKAI',
-  'WEB3D'
-};

test/base/assets.json

@@ -358,7 +358,6 @@
             "invalid_extension_name.gltf": "Invalid extension name",
             "named_objects.gltf": "Valid named objects",
             "undefined_used_extensions.gltf": "Undefined used extensions array",
-            "unreserved_extension_prefix.gltf": "Unreserved extension prefix",
             "unused_objects.gltf": "Unused objects",
             "valid.gltf": "Valid"
         }