XForms Hello, in Haml

gistfile1.haml

%xh:html{ "xmlns:xh" => "http://www.w3.org/1999/xhtml",
           "xmlns:xf" => "http://www.w3.org/2002/xforms"}
  %xh:head
    %xh:title XForms Hello
    %xf:model
      %xf:instance
        %first-name
  %xh:body
    %xh:p
      %xh:i
        This example is described in details in the
        %xh:a(href="/doc/intro-tutorial") Orbeon Forms Tutorial
      %xf:input(ref="/first-name" incremental="true")
        %xf:label Please enter your first name
    %xh:p
      %xf:output(value="if (normalize-space(/first-name) = '') then '' else concat('Hello, ', /first-name, '!')" )