Mediawiki API

Mediawiki API: semantic search and download

Script wiki-download.py from scan-utils, interfaces with the mediawiki API in order to download files according to ask requests.

API what is the API?

More on the basics of MW API in Wiki_publishing#API

Semantic queries: ASK

Semantic MediaWiki includes a simple query language for Semantic search, so that users can directly request certain information from the wiki..

Inside a wiki, with SMW extension installed,the page [[Special:Ask]] provides a interface for query the wiki. See Autonomous Archive's Special:Ask

Although there are many parameters possible to include, let's keep it simple and focus on syntax for Selecting pages

Selecting pages

Wiki pages

• select all pages under the File: namespace (all files) [[File:+]]
• select all pages under the User: namespace (all users) [[User:+]]

Semantic properties and values

• all pages/items with property Actor [[Actor::+]]
• all pages/items with property Actor::Eetcafe [[Actor::Eetcafe]]

Combining more than one query string

• all File: pages/items with property Production_Method::Typewriter [[Files:+]][[Production_Method::Typewriter]]
• all File: pages/items

Notes on selecting pages

Difference between Wiki pages and Semantic property and values:

• 1 : wiki pages [[User:Zalán_Szakács]]User:Zalán_Szakács
• 2 :: semantic property values [[Production_Method::Typewriter]]

Displaying information on a property can be done by include in the ?Property to the Additional data to display window.

• ?Production Method display the Production_Method values of the page
• ?Actor|?Origin display the Actor and Origin values of the page

Finding existing properties and their use:

• Visit the Special:Properties page
• Visit the Special:3ASearchByProperty page

Api

The same Ask requests, which we have been making the wiki Ask interface, can be made using the mediawiki API, through the ASK module

Using: /api.php?action=ask&query=

https://aa.xpub.nl/api.php?action=ask&query=Production_Method::+&format=jsonfm

https://aa.xpub.nl/api.php?action=ask&query=Actor::Poortgebouw&format=jsonfm

https://aa.xpub.nl/api.php?action=ask&query=Actor::PoortgebouwProduction_Method::Typewriter&format=jsonfm

Note that:

• we start using the [[ ]], which we were in the wiki ask interface
• the + sign is encoded with URL percent encoding, becoming %2B
• we are declaring the format format=jsonfm, format=xml are possible

Script

With the wiki-download.py script from https://git.xpub.nl/scan-utils/ we can perform the same semantic queries, and dowload the resulting items, if they happen to be a file

Usage: python wiki-download.py --help ask for help

python wiki-download.py --download imgs --ask [[Production_Method::Typewriter]]

python wiki-download.py --download imgs --ask [[Production_Method::+]][[Document_Type::Flyer]]