Package fr.mines_stetienne.ci.sparql_generate.xml

Class ITER_XPath

java.lang.Object
fr.mines_stetienne.ci.sparql_generate.iterator.IteratorStreamFunctionBase
fr.mines_stetienne.ci.sparql_generate.iterator.IteratorFunctionBase
fr.mines_stetienne.ci.sparql_generate.xml.ITER_XPath
All Implemented Interfaces:
fr.mines_stetienne.ci.sparql_generate.iterator.IteratorFunction
public class ITER_XPath extends fr.mines_stetienne.ci.sparql_generate.iterator.IteratorFunctionBase
Iterator function iter:XPath extracts parts of a XML document, using XPath queries.

See Live example

  • Param 1: (xml): the URI of the XML document (a URI), or the XML document itself (a String);
  • Param 2: (xPath) the XPath query;
  • Param 3 .. N : (auxXPath ... ) other XPath queries, which will be executed over the results of the execution of xPath, and provide one result each.
The following variables may be bound:
  • Output 1: (literal) matched XML element, encoded as a boolean, float, double, integer, string, as it best fits;
  • Output 2 .. N-1: (string) result of the execution of the auxiliary XPath queries on Output 1, encoded as a boolean, float, double, integer, string, as it best fits;
  • Output N: (integer) the position of the result in the list;
  • Output N+1: (boolean) true if this result has a next result in the list.
Output N and N+1 can be used to generate RDF lists from the input, but the use of keyword LIST( ?var ) as the object of a triple pattern covers most cases more elegantly.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static String
    URI
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    ITER_XPath()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    checkBuild​(org.apache.jena.sparql.expr.ExprList args)
     
    List<List<org.apache.jena.sparql.expr.NodeValue>>
    exec​(List<org.apache.jena.sparql.expr.NodeValue> args)
     

    Methods inherited from class fr.mines_stetienne.ci.sparql_generate.iterator.IteratorFunctionBase

    exec

    Methods inherited from class fr.mines_stetienne.ci.sparql_generate.iterator.IteratorStreamFunctionBase

    build, exec, getContext

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

  • Constructor Details

    • ITER_XPath

      public ITER_XPath()

  • Method Details

    • exec

      public List<List<org.apache.jena.sparql.expr.NodeValue>> exec​(List<org.apache.jena.sparql.expr.NodeValue> args)
      Specified by:
      exec in class fr.mines_stetienne.ci.sparql_generate.iterator.IteratorFunctionBase

    • checkBuild

      public void checkBuild​(org.apache.jena.sparql.expr.ExprList args)
      Specified by:
      checkBuild in class fr.mines_stetienne.ci.sparql_generate.iterator.IteratorStreamFunctionBase