title: Define and use a “variable” in a Target
body: <p>In a <code>Target</code>, I need to use <code>%(Foo.Filename)%(Foo.Extension)</code> several times.</p>
  
  <p>Is there a way to define a “variable” (or something similar) that can be used instead of <code>%(Foo.Filename)%(Foo.Extension)</code>? Preferably inside the <code>Target</code>?</p>
  
  <p>(For the sake of completeness: <code>%(Foo.Identity)</code> is something different.)</p>