var specifier = SyntaxFactory.AttributeTargetSpecifier( SyntaxFactory.Token(SyntaxKind.ReturnKeyword) );
var specifier = SyntaxFactory.AttributeTargetSpecifier( SyntaxFactory.Token(SyntaxKind.MultiKeyword) );This code creates an AttributeTargetSpecifier that allows the attribute to be applied to multiple targets, such as a method and a class. The package library for AttributeTargetSpecifier is Microsoft.CodeAnalysis.CSharp.SyntaxFactory.