Comment by librasteve

Here's how the built-in Raku Grammar can be used to parse this. I can see Raku generating the XML as the Actions from this Grammar so allow ease of DSL authoring with XML as a interchange and strict scheme validation format.

  grammar InvoiceDSL {

    token TOP {
        ^ <invoice>+ % \n* $
    }

    token invoice {
        <header>
        \n
        <line>+
    }

    token header {
        'invoice' \h+ <id=string> \h+ 'for' \h+ <client=string>
    }

    token line {
        \h**4 <entry> \n?
    }

    token entry {
        | <item>
        | <tax>
        | <discount>
    }

    token item {
        'item' \h+ <desc=string> \h+ <price=num> \h+ 'x' \h+ <qty=int>
    }

    token tax {
        'tax' \h+ <percent=num> '%'
    }

    token discount {
        'discount' \h+ <percent=num> '%'
    }

    token string { \" <( <-["]>* )> \" }
    token num    { \d+ [ '.' \d+ ]? }
    token int    { \d+ }
  }