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Gregory Todd Williams > RDF-Trine > RDF::Trine::Parser



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Module Version: 1.019   Source  


RDF::Trine::Parser - RDF Parser class


This document describes RDF::Trine::Parser version 1.019


 use RDF::Trine::Parser;
 RDF::Trine::Parser->parse_url_into_model( $url, $model );
 my $parser     = RDF::Trine::Parser->new( 'turtle' );
 $parser->parse_into_model( $base_uri, $rdf, $model );
 $parser->parse_file_into_model( $base_uri, 'data.ttl', $model );


RDF::Trine::Parser is a base class for RDF parsers. It may be used as a factory class for constructing parser objects by name or media type with the new method, or used to abstract away the logic of choosing a parser based on the media type of RDF content retrieved over the network with the parse_url_into_model method.



Returns the canonical media type associated with this parser.


Returns the media types associated with this parser.

parser_by_media_type ( $media_type )

Returns the parser class appropriate for parsing content of the specified media type. Returns undef if not appropriate parser is found.

guess_parser_by_filename ( $filename )

Returns the best-guess parser class to parse a file with the given filename. Defaults to RDF::Trine::Parser::RDFXML if not appropriate parser is found.

new ( $parser_name, @args )

Returns a new RDF::Trine::Parser object for the parser with the specified name (e.g. "rdfxml" or "turtle"). If no parser with the specified name is found, throws a RDF::Trine::Error::ParserError exception.

Any @args will be passed through to the format-specific parser constructor.

If @args contains the key-value pair (canonicalize => 1), literal value canonicalization will be attempted during parsing with warnings being emitted for invalid lexical forms for recognized datatypes.

parse_url_into_model ( $url, $model [, %args] )

Retrieves the content from $url and attempts to parse the resulting RDF into $model using a parser chosen by the associated content media type.

If %args contains a 'content_cb' key with a CODE reference value, that callback function will be called after a successful response as:

 $content_cb->( $url, $content, $http_response_object )

If %args contains a 'useragent' key with a LWP::UserAgent object value, that object is used to retrieve the requested URL without any configuration (such as setting the Accept: header) which would ordinarily take place. Otherwise, the default user agent ("default_useragent" in RDF::Trine) is cloned and configured to retrieve content that will be acceptable to any available parser.

parse_url ( $url, \&handler [, %args] )

Retrieves the content from $url and attempts to parse the resulting RDF. For each parsed RDF triple that is parsed, &handler will be called with the triple as an argument. Otherwise, this method acts just like parse_url_into_model.

parse_into_model ( $base_uri, $data, $model [, context => $context] )

Parses the bytes in $data, using the given $base_uri. For each RDF statement parsed, will call $model->add_statement( $statement ).

parse_file_into_model ( $base_uri, $fh, $model [, context => $context] )

Parses all data read from the filehandle or file $fh, using the given $base_uri. For each RDF statement parsed, will call $model->add_statement( $statement ).

parse_file ( $base_uri, $fh, $handler )

Parses all data read from the filehandle or file $fh, using the given $base_uri. If $fh is a filename, this method can guess the associated parse. For each RDF statement parsed, $handler->( $st ) is called.

parse ( $base_uri, $rdf, \&handler )
new_bnode_prefix ()

Returns a new prefix to be used in the construction of blank node identifiers. If either Data::UUID or UUID::Tiny are available, they are used to construct a globally unique bnode prefix. Otherwise, an empty string is returned.


Returns the default HTTP Accept header value used in requesting RDF content (e.g. in "parse_url_into_model") that may be parsed by one of the available RDF::Trine::Parser subclasses.

By default, RDF/XML and Turtle are preferred over other media types.


Please report any bugs or feature requests to through the GitHub web interface at


Gregory Todd Williams <>


Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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