计算机科学论坛--关于RDF的一些疑问

贴子主题：关于RDF的一些疑问

本主题类别:

1.看完语义网络基础，本来一直以为这rdfs:domain 只能是Class的。
今天在Practical RDF上看到，有的属性的rdfs:domain 是指向Property的。但是Property默认是小写的，书里定义属性relevancy的地方是小写的，rdfs:domain 里面引用的时候又用大写的Relevancy了。。。。不知道有没有关系。

2.还有如果一个类A，一个属性B，如果A内的属性B是通过rdf:Seq组织的，B的domain写A还是rdf:Seq？如果写A的话，通过什么方式来在Schema内指出B在A内，而且是以rdf:Seq方式组织的。

3.xml的Schema应该是一看就知道怎么通过这个Schema写xml的。RDF的Schema对于Property的domain和range的定义有些广泛（没有详细指明那个类，用广泛的resours指代）。是否都是需要通过第3个文件来详细描绘类和属性的组织。

4.类Resourse 有属性 bio, bio 又有N个子属性description、author等。一般惯例是为bio再开一个类Bio组织子属性，还是直接让这些子属性依附于属性bio？

<?xml version="1.0"?>
<rdf:RDF xml:lang="en"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">

<rdfs:Class rdf:about="http://burningbird.net/postcon/elements/1.0/Resource">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en"> Web Resource</rdfs:label>
<rdfs:comment xml:lang="en">
Web resource managed with PostCon system
</rdfs:comment>
<rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource" />
</rdfs:Class>

<rdfs:Class rdf:about="http://burningbird.net/postcon/elements/1.0/Movement">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en"> Web Resource Movement</rdfs:label>
<rdfs:comment xml:lang="en">
An event for the resource within the PostCon system
</rdfs:comment>
</rdfs:Class>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/bio">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Resource biography</rdfs:label>
<rdfs:comment xml:lang="en">
Biographical information for resource
</rdfs:comment>
<rdfs:range rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
<rdfs:domain rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/relevancy">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Resource Relevancy</rdfs:label>
<rdfs:comment xml:lang="en">
Biographical information for resource
</rdfs:comment>
<rdfs:range rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
<rdfs:domain rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/presentation">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Resource Presentation</rdfs:label>
<rdfs:comment xml:lang="en">
Information related to relevancy of resource
</rdfs:comment>
<rdfs:range rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
<rdfs:domain rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/history">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en"> Web Content History</rdfs:label>
<rdfs:comment xml:lang="en">
History of movement of content within system
</rdfs:comment>
<rdfs:range rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
<rdfs:domain rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/currentStatus">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Current Status</rdfs:label>
<rdfs:comment>Current status of document (allowable values of Active and Inactive)</rdfs:
comment>
<rdfs:range rdf:resource="http://www.w3.org/2000/01/rdf-schema#Literal"/>
<rdfs:domain rdf:resource="http://postcon/elements/1.0/Relevancy"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/reason">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Reason</rdfs:label>
<rdfs:comment>Reason</rdfs:comment>
<rdfs:range rdf:resource="http://www.w3.org/2000/01/rdf-schema#Literal"/>
<rdfs:domain rdf:resource="http://postcon/elements/1.0/Resource"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/movementType">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Movement Type</rdfs:label>
<rdfs:comment>Type of Movement (allowable values of Move, Add, Remove)</rdfs:comment>
<rdfs:range rdf:resource="http://www.w3.org/2000/01/rdf-schema#Literal"/>
<rdfs:domain rdf:resource="http://postcon/elements/1.0/Movement"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/related">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en"> Related Resource</rdfs:label>
<rdfs:comment xml:lang="en">
Resources within PostCon system related to current resource
</rdfs:comment>
<rdfs:range rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/requires">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Resource Requirement</rdfs:label>
<rdfs:comment xml:lang="en">
External resource required by current resource
</rdfs:comment>
<rdfs:range rdf:resource="http://burningbird.net/postcon/elements/1.0/Resource"/>
</rdf:Property>

<rdf:Property rdf:about="http://burningbird.net/postcon/elements/1.0/type">
<rdfs:isDefinedBy rdf:resource="http://burningbird.net/postcon/elements/1.0/"/>
<rdfs:label xml:lang="en">Resource Type</rdfs:label>
<rdfs:comment>Type of Required Resource</rdfs:comment>
<rdfs:range rdf:resource="http://www.w3.org/2000/01/rdf-schema#Literal"/>
</rdf:Property>

</rdf:RDF>

Example 6-5. PostCon vocabulary instance showing Movement and related resources
<?xml version="1.0"?>
<rdf:RDF
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:pstcn="http://burningbird.net/postcon/elements/1.0/"
  xml:base="http://burningbird.net/articles/">

<pstcn:Resource rdf:about="monsters1.htm">

<pstcn:bio rdf:parseType="Resource">
        <pstcn:title>Tale of Two Monsters: Legends</pstcn:title>
       <pstcn:abstract>
         When I think of "monsters" I think of the creatures of
         legends and tales, from the books and movies, and
         I think of the creatures that have entertained me for years.
       </pstcn:abstract>
        <pstcn:description>
         Part 1 of four-part series on cryptozoology, legends,
         Nessie the Loch Ness Monster and the giant squid.
        </pstcn:description>
        <pstcn:dateCreated>1999-08-01T00:00:00-06:00</pstcn:dateCreated>
        <pstcn:author>Shelley Powers</pstcn:author>
        <pstcn:owner>Burningbird Network</pstcn:owner>
     </pstcn:bio>

<pstcn:related rdf:resource="monsters2.htm" />
     <pstcn:related rdf:resource="monsters3.htm" />
     <pstcn:related rdf:resource="monsters4.htm" />

<pstcn:history>
       <rdf:Seq>
        <rdf:_1 rdf:resource="http://www.yasd.com/dynaearth/monsters1.htm" />
        <rdf:_2 rdf:resource="http://www.dynamicearth.com/articles/monsters1.htm" />
        <rdf:_3 rdf:resource="http://burningbird.net/articles/monsters1.htm" />
      </rdf:Seq>
     </pstcn:history>

</pstcn:Resource>

<pstcn:Resource rdf:about="monsters2.htm">
     <pstcn:title>Cryptozooloy</pstcn:title>
     <pstcn:reason>First in the Tale of Two Monsters series.</pstcn:reason>
  </pstcn:Resource>
  <pstcn:Resource rdf:about="monsters3.htm">
     <pstcn:title>A Tale of Two Monsters: Architeuthis Dux (Giant Squid)</pstcn:title>
     <pstcn:reason>Second in the Tale of Two Monsters series.</pstcn:reason>
  </pstcn:Resource>
  <pstcn:Resource rdf:about="monsters4.htm">
     <pstcn:title>Nessie, the Loch Ness Monster </pstcn:title>
     <pstcn:reason>Fourth in the Tale of Two Monsters series.</pstcn:reason>
  </pstcn:Resource>

<pstcn:Movement rdf:about="http://www.yasd.com/dynaearth/monsters1.htm">
      <pstcn:movementType>Add</pstcn:movementType>
      <pstcn:reason>New Article</pstcn:reason>
      <pstcn:date>1998-01-01T00:00:00-05:00</pstcn:date>
  </pstcn:Movement>
  <pstcn:Movement rdf:about="http://www.dynamicearth.com/articles/monsters1.htm">
      <pstcn:movementType>Move</pstcn:movementType>
      <pstcn:reason>moved to dynamicearth.com domain</pstcn:reason>
      <pstcn:date>1999-10-31:T00:00:00-05:00</pstcn:date>
  </pstcn:Movement>
  <pstcn:Movement rdf:about="http://burningbird.net/articles/monsters1.htm">
     <pstcn:movementType>Move</pstcn:movementType>
     <pstcn:reason>Moved to burningbird.net</pstcn:reason>
     <pstcn:date>2002-11-01:T00:00:00-05:00</pstcn:date>
  </pstcn:Movement>

</rdf:RDF>


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