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Sam Thursfield: [GNOME] Tracker documentation improvements

Submitted by Roy Schestowitz on Sunday 26th of April 2020 01:11:16 AM Filed under
GNOME

It’s cool storing stuff in a database, but what if you shared the database schema so other tools can work with the data? That’s the basic idea of Linked Data which Tracker tries to follow when indexing your content.

In a closed music database, you might see a “Music” table with a “name” column. What does that mean? Is it the name of a song, an artist, an album, … ? You will have to do some digging to find out.

When Tracker indexes your music, it will create a table called nmm:MusicAlbum. What does that mean? You can click the link to find out, because the database schema is self-documenting. The abbreviation nmm:MusicAlbum expands to a URL, which clearly identifies the type of data being stored.

By formalising the database schema, we create a shared vocabulary for talking about the data. This is very powerful – have you seen GMail Highlights, where a button appears in your email inbox to checkin for a flight and such things? These are powered by the https://schema.org/ shared vocabulary. Google don’t manually add support to GMail for each airline in the world. Instead, the airlines embed a https://schema.org/FlightReservation resource in the confirmation email which GMail uses to show the information. The vocabulary is an open standard, so other email providers can use the same data and even propose improvements. Everyone wins!

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