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What kind of items and which attributes are indexed? E. g. desktop/launchers, documents; what metadata?

Where's the index stored? sqlite, couchdb, ...?

Which query language is used; what's the query like? How are results ranked/ordered? I'd like to see an example query.

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Unity makes use of Zeitgeist in its dash where it provides the user with easy access to its most and recently used data (files/folders/applications) as well as searching over the Zeitgeist FTS (Full Text Search) extension.

There is more development going on to bring the same features to a contacts dash where the user can browse his contacts by most/recently used. enter image description here

From the Zeitgeist website:

This page also explains the activity journal (you need to install this yourself) where you can find the answer to how results ranked/ordered and more.

So it uses metadata.

The 2nd part of your question is answered from another page from that site: Which technologies does Zeitgeist use?

  1. Python
  2. DBus
  3. SQLite.
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  • The core part of Zeitgeist uses these. Plus glib for mainloop. For fts extension (which is also installed by default) it needs xapian
    – Manish Sinha
    Jun 15, 2011 at 13:23
  • the link seems to be broken but here's one to the Launchpad project
    – Zanna ♦
    Jul 17, 2016 at 16:40

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