Here’s a short wiring sketch and notes for adding this federatedStatementValuesEnabled setting (naming TBD) for Federated Statement Values (FSV). This follows the same pattern as was done with the Federated Proeperties proof of concept (i.e federatedPropertiesEnabled)

The user configures in LocalSettings.php, e.g.:

$wgWBRepoSettings['federatedStatementValuesEnabled'] = true;

And we access the value of that setting in code using the following pattern:

use Wikibase\Repo\WikibaseRepo;
...
$enabled = WikibaseRepo::getSettings()->getSetting( 'federatedStatementValuesEnabled' );

Default value:

A default value for this setting should be added to repo/config/Wikibase.default.php such that it’s false / off by default:

// repo/config/Wikibase.default.php
return [
    // ...
    'federatedStatementValuesEnabled' => false,
    // ...
];

Docs:

A new entry for this setting should be added to docs/topics/options.md (this file generates the Wikibase: Options page). For now place it right before federatedPropertiesEnabled under Repository settings → Miscellaneous, and match current formatting. Something very much like this:

#### federatedStatementValuesEnabled {#repo_federatedStatementValuesEnabled}
Enable the Federated Statement Values feature. When enabled, this allows using Items from a remote Wikibase (for example, Wikidata) as values in statements on this repository.

DEFAULT:  `\``false`\``

Todo / next steps:

• Add default setting in repo/config/Wikibase.default.php
• Add docs entry to docs/topics/options.md
• Push changes to a new feature working branch for upcoming/ongoing FSV feature development

The changes to add a federatedValuesEnabled flag are on Gerrit and marked as work in progress. They're meant to be amended by code from other tasks, where the flag can be used and propagated. For that reason, the open change set is linked to the epic ticket.