alcamo/rdf-literal

RDF literals

0.1.5 2026-04-21 16:22 UTC

Requires

• php: 7.3 - 8.0
• alcamo/binary-data: ^0.6
• alcamo/time: ^0.2
• alcamo/uri: ^0.2
• alcamo/xml: ^0.1

Requires (Dev)

• php-ds/php-ds: ^1.3
• phpunit/phpunit: ^9.5
• squizlabs/php_codesniffer: 3.*

Apache-2.0

• RDF
• datatype
• literal

README

use alcamo\rdf_literal\LiteralFactory;

include $_composer_autoload_path ?? __DIR__ . '/../vendor/autoload.php';

$factory = new LiteralFactory();

$number = $factory->create(1970);

echo $number . PHP_EOL;

echo $number->getDatatypeUri() . PHP_EOL;

$year = $factory->create(1970, LiteralFactory::XSD_NS . 'gYear');

echo $year . PHP_EOL;

echo $year->getDatatypeUri() . PHP_EOL;

echo "Literals are "
    . ($year->equals($number) ? '' : 'not')
    . ' equal' . PHP_EOL;

This example is contained in this package as a file in the bin directory. It will output

1970
http://www.w3.org/2001/XMLSchema#integer
1970
http://www.w3.org/2001/XMLSchema#gYear
Literals are not equal

Overview

The classes that implement LiteralInterface represent the concept of RDF Literals, i.e. data elements that have a datataype and may have a language tag.

Among others, this allows to:

• Create values of various types from strings, governed by an XSD datatype URI.
• Add a __toString() function to values which are not stringable.
• Add a custom __toString() function which differs from the default representation of a value.
• Distinguish values that may be represented the same way in PHP but have different meanings.

See the doxygen documentation for details.