Default Reference Values

[Mark Hawkes]

In Perl, using HTML::Template, I can specify a default value in case the 
template variable remains unassigned, like so:

  <h1><tmpl_var name="greeting" default="hello"></h1>
How can I emulate this in VTL, so that if there's no value for 
"greeting" in the context it displays "hello" instead of just "$greeting"...

  <h1>$greeting</h1>
Many TIA,
Marco
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