schema test {
  document test {
    field id type int {
      indexing: attribute | summary 
    }
  }
  rank-profile default {
    first-phase {
      expression: attribute(id) + 10
    }
  }
  rank-profile match_features inherits default {
    function myfunc() {
      expression: attribute(id) + 20
    }
    match-features: attribute(id) myfunc()
  }
}