<!ELEMENT RecommendCar (person, hasContract)>
<!ELEMENT person (#PCDATA)*>
  <!ATTLIST person rdf:resource CDATA #IMPLIED>
<!ELEMENT hasContract (Contract)>
  <!ATTLIST hasContract rdf:resource CDATA #REQUIRED>
<!ELEMENT Contract (type, atStation, price)>
<!ELEMENT type EMPTY>
  <!ATTLIST type rdf:resource CDATA #REQUIRED>
<!ELEMENT atStation EMPTY>
  <!ATTLIST atStation rdf:resource CDATA #REQUIRED>
<!ELEMENT price (#PCDATA)>
  <!ATTLIST atStation rdf:resource CDATA #REQUIRED>