CONSTRUCT
  past-feed {{ all var X }}
FROM
  ns-prefix atom = "http://www.w3.org/2005/Atom"
  in {
    resource [ "%2$s", "Xml" ],
    atom:feed {{
      var X
    }}
  }
END

CONSTRUCT
  future-feed {{ all var X }}
FROM
  ns-prefix atom = "http://www.w3.org/2005/Atom"
  in {
    resource [ "%3$s", "xml" ],
    atom:feed {{
      var X
    }}
  }
END

CONSTRUCT
  current-feed {{ all var X }}
FROM
  ns-prefix atom = "http://www.w3.org/2005/Atom"
  in {
    resource [ "%1$s", "xml" ],
    atom:feed {{
      var X
    }}
  }
END