Core Platform Team/Initiative/Stability annotations/interfaces

Interfaces designed to be implemented directly by extensions
includes/Rest/Validator/BodyValidator.php includes/api/ApiSerializable.php includes/config/Config.php includes/config/MutableConfig.php includes/dao/IDBAccessObject.php includes/debug/logger/Spi.php includes/deferred/DeferrableCallback.php includes/deferred/DeferrableUpdate.php includes/deferred/EnqueueableDataUpdate.php includes/deferred/MergeableUpdate.php includes/deferred/TransactionRoundAwareUpdate.php includes/exception/ILocalizedException.php includes/jobqueue/GenericParameterJob.php includes/jobqueue/RunnableJob.php includes/language/MessageLocalizer.php includes/libs/rdbms/database/position/DBMasterPos.php includes/libs/services/DestructibleService.php includes/libs/services/SalvageableService.php includes/libs/stats/IBufferingStatsdDataFactory.php includes/libs/stats/StatsdAwareInterface.php includes/pager/Pager.php includes/preferences/PreferencesFactory.php includes/search/PaginatingSearchEngine.php includes/search/ResultAugmentor.php includes/search/ResultSetAugmentor.php includes/utils/RowUpdateGenerator.php

...plus all the hook interfaces!

Interfaces that should not be implemented directly
includes/content/Content.php includes/logging/LogEntry.php includes/search/ISearchResultSet.php includes/search/SearchIndexField.php

Problematic Interfaces that should not be implemented directly
includes/context/IContextSource.php - BlueSpiceFoundation