anchor.diff:                        XAttribute(NsNone + "Project", dependencyTargets),
                         XAttribute(NsNone + "Condition", condition))
       }
  +
  +let GenerateProjectContent (package : Package) (imports : XElement seq) (choose : XElement) =
  +    let defineName = PackagePropertyName package.Id
  +    let propCondition = sprintf "'$(%s)' == ''" defineName
  +    let project = XElement (NsMsBuild + "Project",
  +                    XAttribute (NsNone + "Condition", propCondition),
  +                    XElement (NsMsBuild + "PropertyGroup",
  +                        XElement (NsMsBuild + defineName, "Y")),
  +                    imports,
  +                    choose)
  +    project
   
   let GetPackageDependencies (xnuspec : XDocument) =
       xnuspec.Descendants().Where(fun x -> x.Name.LocalName = "dependency") 
  
positive.code:     let xnuspec = XDocument.Load (nuspecFile.FullName)
      let dependencies = GetPackageDependencies xnuspec
  
      let whens = GenerateTargetForAllFxVersion libDir
      let imports = GenerateDependencyImportContent dependencies
      let choose = if whens.Any() then XElement (NsMsBuild + "Choose", whens)
                   else null
  
      let defineName = PackagePropertyName package.Id
      let propCondition = sprintf "'$(%s)' == ''" defineName
      let project = XElement (NsMsBuild + "Project",
                      XAttribute (NsNone + "Condition", propCondition),
                      XElement (NsMsBuild + "PropertyGroup",
                          XElement (NsMsBuild + defineName, "Y")),
                      imports,
                      choose)
  
      let targetFile = pkgDir |> GetFile "package.targets" 
      project.Save (targetFile.FullName)
  
negative.code:                                             else
                                                  null
  
  let GenerateChooseContent (libDir : DirectoryInfo) =
      let whens = seq {
              if libDir.Exists then
                  let fxFolders = libDir.EnumerateDirectories()
                  for (fxName, _) in FxVersion2Folder do
                      let fxWhens = FxVersion2Folder |> Seq.skipWhile (fun (fx, _) -> fx <> fxName)
                                                     |> Seq.map (fun (_, folders) -> GenerateWhenContent folders fxName fxFolders)
                      let fxDefaultWhen = [ [""] ] |> Seq.map (fun folders -> GenerateWhenContent folders fxName [libDir])
                      let fxWhen = Seq.append fxWhens fxDefaultWhen |> Seq.tryFind (fun x -> x <> null)
  
                      match fxWhen with
                      | Some x -> yield x
                      | None -> ()
          }
      if whens.Any() then XElement (NsMsBuild + "Choose", whens)
      else null
      
  let GenerateDependenciesContent (dependencies : string seq) =
      seq {
          for dependency in dependencies do
              let dependencyTargets = sprintf "%s%s/package.targets" MSBUILD_PACKAGE_FOLDER dependency
  