A very specific tool, that converts the SQL dump of Wikipedia into RDF files suitable to be imported by dgraph.
For now, it only converts the page and the pagelinks tables. This is because I'm only interested in the links between pages (and especially between encyclopedia pages). I might add support for the category and categorylinks tables.
It's written in rust and makes use of cargo. So just type:
$ git clone https://github.com/Picani/wikipedia-dump-converter.git
$ cd wikipedia-dump-converter
$ cargo build --release
The executable is now target/release/wikipedia-dump-converter. Move it
somewhere on your PATH.
Print the help with:
$ wikipedia-dump-converter -h
First, convert the page table dump:
$ wikipedia-dump-converter -i pages -e page_table_dump.sql.gz converted_pages.rdf.gz
Remove the -i argument to stop when encountering a text encoding error in the
dump, instead of printing it and continuing.
Remove the -e argument to also convert non-encyclopedia pages (like user
pages, help pages, etc).
The resulting file looks like the following:
$ zcat converted_pages.rdf.gz | head
<3> <namespace> "0" .
<3> <title> "Antoine Meillet" .
<7> <namespace> "0" .
<7> <title> "Algèbre linéaire" .
<9> <namespace> "0" .
<9> <title> "Algèbre générale" .
<10> <namespace> "0" .
<10> <title> "Algorithmique" .
<11> <namespace> "0" .
<11> <title> "Politique en Argentine" .
In RDF triple terminology, the subject is the page unique ID, the
predicate is either title or namespace and the object is either the page
title (when the predicate is title) or the namespace unique ID (when the
predicate is namespace). The list of namespaces is available here.
Then, convert the pagelinks table dump:
$ wikipedia-dump-converter -i links pagelinks_table_dump.sql.gz converted_page.rdf.gz converted_links.rdf.gz
Again, remove the -i argument to stop when encountering a text encoding error
in the dump, instead of printing it and continuing.
The resulting file looks like the following:
$ zcat converted_links.rdf.gz | head
<177374> <linksto> <222657> .
<315352> <linksto> <222657> .
<1175072> <linksto> <222657> .
<3578724> <linksto> <222657> .
<7917621> <linksto> <222657> .
<222376> <linksto> <4433171> .
<4452220> <linksto> <4433171> .
<7563679> <linksto> <4433171> .
<7591490> <linksto> <4433171> .
<90880> <linksto> <351979> .
In RDF triple terminology, the subject is the page unique ID from which
the link starts, the predicate is linksto, and the object is the unique ID
of the page pointed to by the link.
Note: Only the links for which both pages are present in
converted_pages.rdf.gz are converted.
Copyright © 2020 Sylvain PULICANI picani@laposte.net
This work is free. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See the LICENSE file for more details.