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----  JENA规则与SPARQL的问题  (http://bbs.xml.org.cn/dispbbs.asp?boardid=2&rootid=&id=65377)

--  作者：dasotkb
--  发布时间：8/4/2008 8:27:00 PM

--  JENA规则与SPARQL的问题
我是JENA进行推理，把规则跟SPARQL都写在程序内，不过现在有个问题，
规则有三条如下
"[rule1:(?x DMCLab:hasGenre 'pop'^^xsd:string)" +
                      "(?x DMCLab:hasYear '2008'^^xsd:int)" +
                         "(?x DMCLab:hasSingerCountValue ?y)" +
                         "ge(?y,80)" +
                     "->(?x DMCLab:MostPopularPopSingerIn2008 DMCLab:people)]" +
                 
                  "[rule2:(?x DMCLab:hasGenre 'pop'^^xsd:string)" +
                   "(?x DMCLab:hasYear '2008'^^xsd:int)" +
                         "(?x DMCLab:hasSingerCountValue ?y)" +
                         "ge(?y,40)"+ "le(?y,79)" +
                     "->(?x DMCLab:MorePopularPopSingerIn2008 DMCLab:people)]" +
          
                  "[rule3:(?x DMCLab:hasGenre 'pop'^^xsd:string)" +
                   "(?x DMCLab:hasYear '2008'^^xsd:int)" +
                         "(?x DMCLab:hasSingerCountValue ?y)" +
                         "ge(?y,0)"+ "le(?y,39)" +
"->(?x DMCLab:NotPopularPopSingerIn2008 DMCLab:people)]";

我的查询如下
String queryString =
       
        "prefix DMCLab:<http://ONTOLOGY/DMCLab#>" +
       
              "SELECT ?singer " +
              
              "WHERE {?singer DMCLab:MostPopularPopSingerIn2008 DMCLab:people } "; 

结果会利用第一条的规则且可以查询到结果，但问题是如果我要查询的是用第二条的规则，我必须要把SPARQL的句子改写成如下

String queryString =
       
        "prefix DMCLab:<http://ONTOLOGY/DMCLab#>" +
       
              "SELECT ?singer " +
              
              "WHERE {?singer DMCLab:MorePopularPopSingerIn2008 DMCLab:people } ";

这样实在很没有弹性，请问有什么办法可以让 DMCLab:MorePopularPopSingerIn2008
改成变量，根据变量去找到适用的规则呢？…THANKS

--  作者：aximou
--  发布时间：8/6/2008 3:41:00 PM

--  
请问这样的规则的写法说明文档哪里有呢?
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