Migrating from libtracker-sparql 1.x to 2.0: Tracker SPARQL Library Reference Manual

# Migrating from libtracker-sparql 1.x to 2.0

Tracker 2.0 is a new major version, containing some possibly incompatible changes. Most of the changes are not hard to adapt, and even unlikely to be a problem if the ported application was kept up-to-date in its usage of 1.x.

## Stricter SPARQL1.1

Tracker supports a large subset of the SPARQL1.1 definition, and offers a number of nonstandard features that are useful. There is however one nonstandard feature that brings no added value.

    # These were equivalent in Tracker 1.x
    SELECT ?u AS ?foo WHERE { ?u ... }
    SELECT ?u AS foo WHERE { ?u ... }

The latter form is not observed in the SPARQL1.1 spec, and support for it has been dropped in Tracker 2.0. If you want to make queries that work on both Tracker 2.0 and 1.x, use the former form, which has also been supported for a long time in 1.x.