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# Qt's Namespaces

This is a list of the main namespaces in Qt. For a list of classes in Qt, see Qt's Classes.

Phonon::BackendCapabilities
Phonon
QDBus | Miscellaneous identifiers used throughout the QtDBus library
QGL | Miscellaneous identifiers used in the Qt OpenGL module
QSql | Miscellaneous identifiers used throughout the Qt SQL library
QSsl | Declares enums common to all SSL classes in QtNetwork
QTest | All the functions and declarations that are related to the QTestLib tool
Qt | Miscellaneous identifiers used throughout the Qt library
QtConcurrent | High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives