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@Persons = (
    {
...
        place    => "place",
    }, # etc etc...
)

  <!-- this is just one of manu expressions -->
  <expr type="match">
    <field type="equal" key="age">25</field>
    <field type="equal" key="surname">aSurName</field>
  </expr>

foreach $field (@Fields) { # <- age and surname in this case
   scalar(@Persons)==0 && return 0;
...
   }
}
#return...