anchor.diff:        (args) => 'Invalid URI ${args[0]}. Parser output: ${args[1]}');
   
     static final SchemaError emptyEntity =
  -      new SchemaError._('EMPTY_ENTITY', (args) => 'Entity can not be empty.');
  +      new SchemaError._('EMPTY_ENTITY', (args) => 'Entity cannot be empty.');
   
     static final SchemaError oneOfMismatch = new SchemaError._('ONE_OF_MISMATCH',
         (args) => 'Exactly one of ${args.map(_q)} properties must be defined.');
  
positive.code:   static final DataError accessorInvalidSign = new DataError._(
        'ACCESSOR_INVALID_SIGN',
        (args) => 'Accessor element at index ${args[0]} '
            'has not a proper sign value in w component: ${args[1]}.');
  
    static final DataError accessorInvalidFloat = new DataError._(
        'ACCESSOR_INVALID_FLOAT',
  
negative.code:       'BUFFER_DATA_URI_MIME_TYPE_INVALID',
        (args) =>
            "Buffer's Data URI MIME-Type must be 'application/octet-stream' "
            "or 'application/gltf-buffer'. Found ${_q(args[0])} instead.");
  
    static final SemanticError bufferViewTooBigByteStride = new SemanticError._(
        'BUFFER_VIEW_TOO_BIG_BYTE_STRIDE',
  