logstash multiline

gistfile1.txt

  file {
    path => ["/home/local/JTAX/curtisc/tax-returns/*"]
    start_position => "beginning"
    type => "tax_return"
    tags => [ "tax_return" ]
    codec => multiline {
      pattern => "^<\?xml .*\?>"
      negate => true
      what => "previous"
    }
    sincedb_path => "/var/log/logstash/.sincedb_tax_returns303"
  }