Redland librdf Language Bindings - Perl Interface

Installing the Redland Perl interface

This is built if --with-perl is given to the configure line, or --with-perl=perl5.8 to use a particular perl version/program. The standard 'make' at the top level will build it.

You can also compile the perl interface by hand as follows:

  cd perl
  make

  # optional
  make check

To install it system wide do this as root (or maybe via sudo make install):

  root# make install

The Redland Perl interface is mature has been tested with the following versions (5.6.0 is the likely minimum; 5.005 is too old).

5.8.3 on Solaris/Sparc
5.8.3 on Linux/x86
5.8.2 on Linux/x86
5.8.1-RC3 on OSX/PPC
5.8.0 on Linux/x86
5.8.0 on Linux/IA64

Testing the Redland Perl interface

If you did the optional install above, run the perl example program with:

  perl ./example.pl

Otherwise, to run in the source tree do:

  perl -Iblib/arch -Iblib/lib ./example.pl

and the result should be:

  Creating storage

  Creating model

  Creating statement

  Adding statement to model

  Adding statement (new Statement(n, n, n)) to model

  Adding statement (n,n,n) to model

  Parsing URI (file) ../data/dc.rdf
  Parsing added 3 statements

  Printing all statements
  Statement: {[http://example.org/foo], [http://example.org/foo], [http://example.org/foo]}
  Statement: {[http://example.org/foo], [http://example.org/foo], [http://example.org/foo]}
  Statement: {[http://www.dajobe.org/], [http://purl.org/dc/elements/1.1/title], "Dave Beckett's Home Page"}
  Statement: {[http://www.dajobe.org/], [http://purl.org/dc/elements/1.1/creator], "Dave Beckett"}
  Statement: {[http://www.dajobe.org/], [http://purl.org/dc/elements/1.1/creator], "Dave Beckett"}
  Statement: {[http://www.dajobe.org/], [http://purl.org/dc/elements/1.1/description], "The generic home page of Dave Beckett."}

  Searching model for statements matching predicate http://purl.org/dc/elements/1.1/creator
  Matching Statement: {[http://www.dajobe.org/], [http://purl.org/dc/elements/1.1/creator], "Dave Beckett"}
    Subject: [http://www.dajobe.org/]
    Predicate: [http://purl.org/dc/elements/1.1/creator]
    Object: Dave Beckett
  Matching Statement: {[http://www.dajobe.org/], [http://purl.org/dc/elements/1.1/creator], "Dave Beckett"}
    Subject: [http://www.dajobe.org/]
    Predicate: [http://purl.org/dc/elements/1.1/creator]
    Object: Dave Beckett

  Searching model for targets of subject http://www.dajobe.org/ predicate http://purl.org/dc/elements/1.1/creator
  Matching Node: Dave Beckett
  Matching Node: Dave Beckett
  Querying for dc:titles:
  result 1: {
    a=[http://www.dajobe.org/]
    c=Dave Beckett's Home Page
  }

  Writing model to test-out.rdf as rdf/xml

Done

Using the Redland Perl API

Read the Redland Perl POD documentation for full details of the classes and methods provided along with examples of use.

The Perl API is an object-based API reflecting the same structure of the Redland objects with simple mappings between them:

Concept	Redland Class	Perl Class	Purpose
Resource / Literal	librdf_node	RDF::Redland::Node, RDF::Redland::BlankNode, RDF::Redland::URINode, RDF::Redland::LiteralNode and RDF::Redland::XMLLiteralNode	RDF Model & Syntax nodes
Statement / Triple	librdf_statement	RDF::Redland::Statement	RDF Model & Syntax arcs (statements, triples) [isa Resource]
Model	librdf_model	RDF::Redland::Model	Set of Statements usually held in one Storage.
Storage	librdf_storage	RDF::Redland::Storage	Storage for Models either persistant or in-memory.
Stream	librdf_stream	RDF::Redland::Stream	Providing sequences of Statements from Parsers, queries.
Parser	librdf_parser	RDF::Redland::Parser	Syntaxes parsers delivering Stream of Statements or writing to a Model
Query	librdf_query	RDF::Redland::Query	Querying of an Model delivering a QueryResults
QueryResults	librdf_query_results	RDF::Redland::QueryResults	Results of applying an Query to a Model giving either variable bindings with Node values or Stream of Statements
Serializer	librdf_serializer	RDF::Redland::Serializer	Serializes a Model into a syntax such as RDF/XML
Iterator	librdf_iterator	RDF::Redland::Iterator	Enumerating lists (of Node) from queries.
URI	librdf_uri	RDF::Redland::URI	Provides URIs for Resources, Parsers, ...
World		RDF::Redland	RDF wrapper class handling Redland startup/shutdown
Digest	librdf_digest		Internal content digest class
Hash	librdf_hash		Internal key:value maps class
		RDF::Redland::RSS	Perl Module providing RSS 1.0 support.

Perl API Reference Documentation

Either use any of the RDF::Redland:: module links above or start at the main RDF::Redland module and follow the references from there.