Redland librdf Language Bindings - Perl RDF::Redland::Statement Class

NAME

RDF::Redland::Statement - Redland RDF Statement Class

SYNOPSIS

  use RDF::Redland;
  my $statement1=new RDF::Redland::Statement($statement);
  my $statement2=new RDF::Redland::Statement($subject,$predicate,$object);
  ...

  if($statement->subject->equals($node)) { 
    ...
  }

DESCRIPTION

Manipulate RDF statements which comprise three RDF::Redland::Node objects. Also used for partial statements which can have empty parts and are used for matching statements in statement queries of the model - see the the RDF::Redland::Model manpage.

CONSTRUCTORS

new NODE NODE NODE|STATEMENT

Create a new statement from nodes or copy an existing statement.

If three NODEs are given, make a new statement from them. Each Node can be a Redland::RDF:Node, a Redland::RDF::URI, a perl URI or a string literal. Otherwise STATEMENT must be an existing statement to copy.

clone

Copy a RDF::Redland::Statement.

METHODS

subject [SUBJECT]

Get/set the statement subject. When a RDF::Redland::Node SUBJECT is given, sets the subject of the statement, otherwise returns a reference to the statement RDF::Redland::Node subject.

predicate [PREDICATE]

Get/set the statement predicate. When RDF::Redland::Node PREDICATE is given, sets the predicate of the statement, otherwise returns a reference to the statement RDF::Redland::Node predicate.

object [OBJECT]

Get/set the statement object. When RDF::Redland::Node OBJECT is given, sets the object of the statement, otherwise returns a reference to the statement RDF::Redland::Node object.

as_string

Return the statement formatted as a string (UTF-8 encoded).

equals STATEMENT

Return non zero if this statement is equal to STATEMENT

OLD METHODS

new_from_nodes SUBJECT PREDICATE OBJECT

Create a new RDF::Redland::Statement with the given RDF::Redland::Node objects as parts (or undef when empty for a partial statement). Use instead:

  $a=new RDF::Redland::Statement($subject, $predicate, $object);

new_from_statement STATEMENT

Create a new RDF::Redland::Statement object from RDF::Redland::Statement STATEMENT (copy constructor). Use instead:

  $s=$old_statement->clone;

SEE ALSO

the RDF::Redland::Node manpage

AUTHOR

Dave Beckett - http://www.dajobe.org/

(C) Copyright (C) 2000-2011 Dave Beckett, (C) Copyright (C) 2000-2005 University of Bristol