/////以上部分都是注释么，但好象又不像?///////////////////////
<!--
This document uses entity types as a shorthand for URIs.
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<rdf:RDF
  xmlns:rdf=   "&rdf;#"
  xmlns:rdfs=   "&rdfs;#"  
  xmlns:owl =     "&owl;#"
  xmlns:xsd=   "&xsd;#"
  xmlns:profile=  "&profile;#"
  xmlns=   "&DEFAULT;#"
  xml:base=       "&DEFAULT;">
//////////////以上一大片我又不知道是什么意思了？////////////////////
  <owl:Ontology rdf:about="">
    <owl:versionInfo>
      $Id: ProfileAdditionalParameters.owl,v 1.10 2004/09/28 06:58:53 martin Exp $
    </owl:versionInfo>
    <rdfs:comment>
      Process and Service Coalition
      Additional concepts and definitions that augment the OWL-S Profile
      ontology.
      These accompany the OWL-S Release
      Created by Terry Payne (terryp@cs.cmu.edu).
      Modified by Massimo Paolucci (paolucci@cs.cmu.edu)

    </rdfs:comment>
    <rdfs:seeAlso rdf:resource="http://www.daml.org/services" />
<!--  
  -->
    <owl:imports rdf:resource="&profile;" />
  </owl:Ontology>

/////////imports 应该是导入别人XML文档的全部内容吧，那么"&profile"是什么用法？ 是引用么？///////////////////////
  <owl:Class rdf:ID="NAICS">
    <rdfs:comment>
      Hook to the NAICS taxonomy
    </rdfs:comment>
    <rdfs:subClassOf rdf:resource="&profile;#ServiceCategory"/>
/////////////这句又不明白，虽然可能可以猜到这里是引用profile里的ServiceCategory定义，但&  ; # 到底是什么个用法呢？////////////

    <rdfs:subClassOf>
      <owl:Restriction>
 <owl:onProperty rdf:resource="&profile;#categoryName"/>
 <owl:hasValue>
   NAICS
 </owl:hasValue>
      </owl:Restriction>
    </rdfs:subClassOf>
    <rdfs:subClassOf>
      <owl:Restriction>
 <owl:onProperty rdf:resource="&profile;#taxonomy"/>
 <owl:hasValue>
   www.naics.com
 </owl:hasValue>
      </owl:Restriction>
    </rdfs:subClassOf>
  </owl:Class>

//烦请大家帮我说说，或者推荐一下看看什么文档也行，先谢了/////////////////