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report=Good Work!  Your validator has been extremely helpful.
Thank You!
RDF=<?xml version="1.0">
<?xml version = '1.0' encoding = 'UTF-8'?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:proj="http://www.unicorn.com/2001/8/ProjML"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:KB="http://www.unicorn.com/2001/12/KBML">
   <Airline xmlns="http://www.unicorn.com/ns/AirlinesSample/AirDemo"
rdf:ID="I0">
      <Airline.name>El Al</Airline.name>
      <Airline.symbol>T</Airline.symbol>
      <Airline.headOfficePhoneNumber rdf:resource="#I1"/>
   </Airline>
   <Airport xmlns="http://www.unicorn.com/ns/AirlinesSample/AirDemo"
rdf:ID="I4">
      <Airport.symbol>TLV</Airport.symbol>
      <Airport.city>Tel Aviv</Airport.city>
      <Airport.name>Ben Gurion</Airport.name>
   </Airport>
   <PhoneNumber xmlns="http://www.unicorn.com/ns/AirlinesSample/AirDemo"
rdf:ID="I5">
      <PhoneNumber.areaCode>212</PhoneNumber.areaCode>
      <PhoneNumber.localNumber>555-1212</PhoneNumber.localNumber>
   </PhoneNumber>
   <Airport xmlns="http://www.unicorn.com/ns/AirlinesSample/AirDemo"
rdf:ID="I3">
      <Airport.symbol>JFK</Airport.symbol>
      <Airport.city>New York</Airport.city>
      <Airport.phoneNumber  rdf:resource="#I5"/>
      <Airport.name>JFK</Airport.name>
   </Airport>
   <PhoneNumber xmlns="http://www.unicorn.com/ns/AirlinesSample/AirDemo"
rdf:ID="I1">
      <PhoneNumber.areaCode>02</PhoneNumber.areaCode>
      <PhoneNumber.localNumber>783-6745</PhoneNumber.localNumber>
   </PhoneNumber>
   <Flight xmlns="http://www.unicorn.com/ns/AirlinesSample/AirDemo"
rdf:ID="I2">
      <Flight.arrivalAirport rdf:resource="#I3"/>
      <Flight.distanceInMiles>7000.0</Flight.distanceInMiles>
      <Flight.departureAirport rdf:resource="#I4"/>
      <Flight.airline rdf:resource="#I0"/>
      <Flight.flightID>001</Flight.flightID>
   </Flight>
</rdf:RDF>