Mylyn relies on Bridges to integrate the context model with the structure
and UI features of domain-specific tools...
Structure Bridge: maps domain-specific elements and relationships to the
generic handleIdentifiers understood by the structure model.
Extension point is: org.eclipse.mylyn.context.core.bridges: structureBridge
Sub-projects are encouraged to provide a framework component and reference
implementations called Connectors that extend Mylyn to different task
management systems and focus the artifacts that you work with when you activate
a task (formerly called Bridges).
https://wiki.eclipse.org/Mylyn/Integrator_Reference#Bridges :
https://wiki.eclipse.org/Mylyn/Contributor_Reference#Project_Structure :