About the root element of the SKOS/RDF

Hi,
Can anyone tell me that which is the root node in the following SKOS/RDF code:

<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF 
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:skos="http://www.w3.org/2004/02/skos/core#"
  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
  xmlns:dc="http://purl.org/dc/elements/1.1/"
  xmlns:dcterms="http://purl.org/dc/terms/"
  xmlns:foaf="http://xmlns.com/foaf/0.1/">

<skos:ConceptScheme rdf:about="http://www.fao.org/aos/agrovoc">
  <dc:title>AGROVOC</dc:title>
  <dc:description>FAO Multilingual Thesaurus.</dc:description>
  <dc:creator>
    <foaf:Organization><foaf:name>FAO</foaf:name></foaf:Organization>
  </dc:creator>
  <dc:rights>Free to all for non commercial use.</dc:rights>
  <dcterms:issued>Tue May 23 07:57:15 CEST 2006</dcterms:issued>
  <dcterms:modified>2006-05-12 17:43:21</dcterms:modified>  
</skos:ConceptScheme>


  <skos:Concept rdf:about="http://www.fao.org/aos/agrovoc#c_3">
    <skos:prefLabel xml:lang="en">ABA</skos:prefLabel>   
    <skos:altLabel xml:lang="en">Abscisic acid</skos:altLabel>    
    <skos:changeNote rdf:parseType="Resource">
     <rdf:value>The last modification for this concept was for the term in SK</rdf:value>
     <dc:creator>
      <foaf:Organization><foaf:name>FAO/GILW</foaf:name></foaf:Organization>
     </dc:creator>
     <dc:date>2005-12-16 00:00:00</dc:date>
     <dc:language>
      <dcterms:RFC1766>
       <rdf:value>EN</rdf:value>
       <rdfs:label>English</rdfs:label>
      </dcterms:RFC1766>
     </dc:language>
    </skos:changeNote>
    <skos:broader rdf:resource="http://www.fao.org/aos/agrovoc#c_3397"/>
    <skos:broader rdf:resource="http://www.fao.org/aos/agrovoc#c_32543"/>
  </skos:Concept>
</rdf:RDF>

Thanks

--

Nabonita
 		
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