Question

I have the following 2 documents. 1 document has this data:

<Content>
  <sem:triples xmlns:sem="http://marklogic.com/semantics">
    <sem:triple>
      <sem:subject>http://sector#Basic_Materials</sem:subject>
      <sem:predicate>http://relationship#isTRBCEconomicSectorOf</sem:predicate>
      <sem:object>http://company#CST_Mining_Group_Limited</sem:object>
    </sem:triple>
  </sem:triples>
  <AnalystName>Henrik Christiansson</AnalystName>
  <DocumentFormat>pdf</DocumentFormat>
</Content>

And another document that has the following data:

<Content>
  <sem:triples xmlns:sem="http://marklogic.com/semantics">
    <sem:triple>
      <sem:triple>
        <sem:subject>http://sector#Energy_-_Fossil_Fuels</sem:subject>
        <sem:predicate>http://relationship#isTRBCEconomicSectorOf</sem:predicate>
        <sem:object>http://company#Bodycote_PLC</sem:object>
      </sem:triple>
    </sem:triple>
  </sem:triples>
  <AnalystName>Pawel Dziedzic</AnalystName>
  <DocumentFormat>pdf</DocumentFormat>
</Content>

I have made a relationship between these two embedded triples as

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

INSERT DATA
{

  <http://company#CST_Mining_Group_Limited> rdfs:subClassOf <http://company#Bodycote_PLC> .

}

When I query to get all the results that are economicSector of Bodycote Plc, I get both of the triples, which is correct, but when I use a combined query it does not give me the required results.

For example, when the query has an economic sector of BodyCote and also the Analyst Name is Henrik Christiansson, I want it to return the first triple but it does not.

I used the following query:

xquery version "1.0-ml";

import module namespace sem = "http://marklogic.com/semantics" 
  at "/MarkLogic/semantics.xqy";

sem:sparql(
  'SELECT ?subject
   WHERE {
     ?subject <http://relationship#isTRBCEconomicSectorOf> <http://company#Bodycote_PLC>
   }',
  (),
  (),
  cts:and-query( (
    cts:element-value-query( xs:QName("AnalystName"), "Henrik Christiansson" )
  ) )
)

I wanted to know if there is a way through which i can apply inferencing in combined queries also.

Answer 1

您的方法的问题是cts：query仅选择相关文档，而不是指定子类的托管三元组。你没有在这里使用真正的推理，但实际上通过字面添加三元组来外化推理规则。相反，使用规则集，更灵活，也可以更好地工作。有关详细信息，请参阅Semantics guide。

准备好规则集文件后，需要将查询包装在sem:store中，然后将规则集应用于sem:ruleset-store：

sem:sparql(
  '
    SELECT ?subject
    WHERE {
      ?subject <http://relationship#isTRBCEconomicSectorOf <http://company#Bodycote_PLC>
    }
  ',
  (),
  (),
  sem:ruleset-store(
    "myrules",
    sem:store(
      (),
      cts:and-query((
       cts:element-value-query( xs:QName("AnalystName"), "Henrik Christiansson" )
      ))
    )
  )
)

HTH！

Inferencing in embedded triples of Marklogic

1 个答案: