title: What is .NET Platform 5.4 in ASP.NET 5 Class Library (Package)?
body: <p>I've added a new Class Library (Package) into ASP.NET 5 based solution. I've noticed .NET Platform 5.4 section in it's project.json:</p>
  
  <pre><code>"frameworks": {
      "net451": {
            "dependencies": {}
      },
      "dotnet5.4": {
        "dependencies": {
          "Microsoft.CSharp": "4.0.1-beta-23516",
          "System.Collections": "4.0.11-beta-23516",
          "System.Linq": "4.0.1-beta-23516",
          "System.Runtime": "4.0.21-beta-23516",
          "System.Threading": "4.0.11-beta-23516"
        }
      }
  }
  </code></pre>
  
  <p>What is it for? Why is it different from the ASP.NET web project?</p>