Bug complex reference using XPath

[ghsnd]

Description

Some XPath expressions involving attribute names used in references lead to errors.

Example

Input

<?xml version="1.0" encoding="UTF-8"?>

<products>
  <product>
    <id>1</id>
    <Property Name="1">
      <String>1</String>
    </Property>
  </product>
</products>

Mapping:

Mind the reference in the rr:ObjectMap

@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix ex: <http://example.com/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
@prefix ql: <http://semweb.mmlab.be/ns/ql#> .

@base <http://example.com/base/> .

<TriplesMap1>
  a rr:TriplesMap;

  rml:logicalSource [
    rml:source "input.xml";
    rml:referenceFormulation ql:XPath;
    rml:iterator "//product"
  ];

  rr:subjectMap [ rr:template "http://example.org/products/{id}" ];

  rr:predicateObjectMap [ 
    rr:predicate ex:id ; 
    rr:objectMap    [ 
      rml:reference "Property[@Name='1']/String";
    ]
  ].

Expected output:

<http://example.org/products/1> <http://example.com/id> "1".

Actual output:

Empty graph.

[ghsnd]

Hi, this issue is fixed with the new release.