Scopes designate channel instances on the unified bus. Channel instances are themselves hierarchical, hence scopes also reflect this structure.

Scope Strings

There is a string-based notation for scopes based on UNIX/URL paths. For example:


This scope designates the channel /a/b/c/ which is a sub-channel of the channels designated by:


/ is sometimes called “root-scope”.

Generally, a scope string is valid if it matches the regular expression /([-_a-zA-Z0-9]+/)*.


For convenience, the final / in scope strings may be omitted when specifying scopes in user interfaces. However, when scope strings are used as keys in associative arrays or in network protocols, scope strings have to be normalized such that they contain the terminating /.


Scope strings are currently case-sensitive, but this may change in future releases. We recommend using all-lowercase scope strings.

Reserved Scopes

The scope /__rsb/ and its subscopes are reserved for implementation purposes and should not be used for user-level communication.


Language File(s)
C++ “0.11” branch of at src/rsb/Scope.{h,cpp}
Java /../rsb-java/src/rsb/
Python /../rsb-python/rsb/
Common Lisp /../rsb-cl/src/scope.lisp