Appendix A: RDFS sample Food Safety ontology

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE rdf:RDF [

<!ENTITY kaon 'http://kaon.semanticweb.org/2001/11/kaon-lexical#'>
<!ENTITY rdf 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
<!ENTITY a 'http://www.fao.org/aos/FoodSafetyExample#'>
<!ENTITY rdfs 'http://www.w3.org/2000/01/rdf-schema#'>
]>

<rdf:RDF xml:base="http://www.fao.org/aos/FoodSafetyExample"

xmlns:kaon="&kaon;"
xmlns:rdf="&rdf;"
xmlns:a="&a;"
xmlns:rdfs="&rdfs;">

<rdfs:Class rdf:ID="Food-Contamination">

<rdfs:label xml:lang="en">Food Contamination</rdfs:label>
<rdfs:subClassOf rdf:resource="#Contamination"/>

</rdfs:Class>
<rdfs:Class rdf:ID="Food">

<rdfs:label xml:lang="en">Food</rdfs:label>
<rdfs:label xml:lang="zh">食å“</rdfs:label>
<rdfs:label xml:lang="fr">Alimentation</rdfs:label>

</rdfs:Class>
<rdfs:Class rdf:ID="Contamination">

<rdfs:label xml:lang="en">Contamination</rdfs:label>

</rdfs:Class>
<rdfs:Class rdf:ID="Country">

<rdfs:label xml:lang="en">Country</rdfs:label>

</rdfs:Class>
<rdf:Property rdf:ID="fromCountry">

<rdfs:label xml:lang="en">fromCountry</rdfs:label>
<rdfs:domain rdf:resource="#Food"/>
<rdfs:range rdf:resource="#Country"/>

</rdf:Property>
<rdf:Property rdf:ID="isContaminatedBy">

<rdfs:label xml:lang="en">isContaminatedBy</rdfs:label>
<rdfs:domain rdf:resource="#Food"/>
<rdfs:range rdf:resource="#Food-Contamination"/>

</rdf:Property>
<rdf:Property rdf:ID="foodSafetyStatus">

<rdfs:label xml:lang="en">foodSafetyStatus</rdfs:label>
<rdfs:range rdf:resource="&rdfs;Literal"/>
<rdfs:domain rdf:resource="#Country"/>

</rdf:Property>
<rdf:Property rdf:ID="level">

<rdfs:label xml:lang="en">level</rdfs:label>
<rdfs:range rdf:resource="&rdfs;Literal"/>
<rdfs:domain rdf:resource="#Contamination"/>

</rdf:Property>
<a:Food rdf:ID="Hamburger">

<rdfs:label xml:lang="en">Hamburger</rdfs:label>
<a:fromCountry rdf:resource="#England"/>
<a:isContaminatedBy rdf:resource="#MediumFoodContamination"/>

</a:Food>
<a:Country rdf:ID="England">

<rdfs:label xml:lang="en">England</rdfs:label>

</a:Country>
<a:Food-Contamination rdf:ID="MediumFoodContamination" a:level="4">

<rdfs:label xml:lang="en">MediumFoodContamination</rdfs:label>

</a:Food-Contamination>
</rdf:RDF>