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Example code of sweetrdf/simple-rdf

Informations about the package simple-rdf

simpleRdf

Latest Stable Version Build status Coverage Status License

An RDF library for PHP implementing the https://github.com/sweetrdf/rdfInterface interface.

The aim was to provide as simple, short and clear implementation as possible. Performance wasn't really important (see the Performance chapter below).

It can be used as a baseline for testing performance of other libraries as well for testing interoperability of the rdfInterface implementations (e.g. making sure they work correctly with rdfInterface\Term objects created by other library).

Installation

Automatically generated documentation

https://sweetrdf.github.io/simpleRdf/namespaces/simplerdf.html

It's very incomplete but better than nothing.\ RdfInterface documentation is included which explains the most important design decisions.

Usage

(you can also take a look at generic rdfInterface examples)

Performance

The simpleRdf\Dataset class shouldn't be used to deal with larger amounts of quads.

Adding a quad has computational complexity of O(N) where N is the number of quads in the dataset. It means adding n quads has computational complexity of O(n!) (read - it quickly gets out of hand with larger n).

Just a sample results:

quads count execution time [s] relative quads count relative execution time
125 0.018090 1 1.0
250 0.059559 2 3.3
500 0.210958 4 11.7
1000 0.849956 8 47.0
2000 2.941319 16 162.6
4000 10.697164 32 591.3
8000 45.792556 64 2531.4

You get the idea, don't you?

Other operations are also not performant, e.g. all searches and in-place deletions have complexity of O(N) and all methods returning a new copy of the dataset have complexity of O(N) + O(n!) (where N is number of quads in the dataset and n the number of quads in the returned dataset).

If you are looking for a performant implementation, please take a look at the quickRdf.

All versions of simple-rdf with dependencies

PHP Build Version
Package Version
Requires php Version >=8.0
zozlak/rdf-constants Version ^1.1
sweetrdf/rdf-interface Version ^2
sweetrdf/rdf-helpers Version ^2
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