==== Entity ====

The system components are called **Entities** because they all inherit from 
the Entity class. Each Entity has specialised [[ddsf:public:guidebook:06_append:glossary:q:quality_of_service_qos_policies|QoS]] policies. An Entity may 
have a [[ddsf:public:guidebook:06_append:glossary:l:listener|Listener]], a call back interface for notifications about changes in 
the Entity’s state or, a wait interface (using WaitSets) for detecting 
changes in the Entity’s state.

Source: [[https://istkb.adlinktech.com/article/vortex-opensplice-dds-glossary/ | OpenSplice Glossary]]