Parsing nested liberals.

[zheyxu]

Some turtle formats are not supported by the Rdflib parser. Following are some examples.

Example 1

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix ex: <http://example.org/stuff/1.0/> .

<http://www.w3.org/TR/rdf-syntax-grammar>
  dc:title "RDF/XML Syntax Specification (Revised)" ;
  ex:editor [
    ex:fullname "Dave Beckett";
    ex:homePage <http://purl.org/net/dajobe/>
  ] .

Example 2

@prefix : <http://example.org/stuff/1.0/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
:a :b
  [ rdf:first "apple";
    rdf:rest [ rdf:first "banana";
               rdf:rest rdf:nil ]
  ] .

The issue is the extension of issue #34

[zheyxu]

The parser can handle first example but not second one.

[srodriguez142857]

@zheyxu:
The first line declares a "default" prefix: there's no prefix associated with the IRI http://example.org/stuff/1.0/.
The first triple is expanded in the following way:

(subject, predicate, object)

• subject: <http://example.org/stuff/1.0/a>
• predicate: <http://example.org/stuff/1.0/b>
• object: It's an RDF list of strings. It will yield [ "apple", "banana" ]