XBuild Returns

msbuild.log

W:\>msbuild xbuild.proj
Microsoft (R) Build Engine version 12.0.31101.0
[Microsoft .NET Framework, version 4.0.30319.42000]
Copyright (C) Microsoft Corporation. All rights reserved.

Build started 15/07/2015 12:53:04 p.m..
Project "W:\xbuild.proj" on node 1 (default targets).
Build:
  Value: Foo
Done Building Project "W:\xbuild.proj" (default targets).


Build succeeded.
    0 Warning(s)
    0 Error(s)

xbuild.log

KzuMac-2:Developer kzu$ xbuild xbuild.proj 
XBuild Engine Version 12.0
Mono, Version 4.0.2.0
Copyright (C) 2005-2013 Various Mono authors

Build started 7/15/2015 12:53:07 PM.
__________________________________________________
Project "/Developer/xbuild.proj" (default target(s)):
	Target Build:
		Value: Foo
Done building project "/Developer/xbuild.proj".

Build succeeded.
	 0 Warning(s)
	 0 Error(s)

xbuild.proj

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

  <Target Name="Build">
    <MSBuild Projects="$(MSBuildThisFileFullPath)" Targets="GetValue">
      <Output TaskParameter="TargetOutputs" PropertyName="Value"/>
    </MSBuild>
    <Message Importance="high" Text="Value: $(Value)" />
  </Target>

  <Target Name="GetValue" Returns="Foo" />

</Project>