Assertion: blackboard | /r/CapableOf | learn through open apis
Facets:
Source sentences:
text: Though the software is proprietary, developers are able to extend the functionality of the system, and create customized course management and delivery by developing software and applications known as Building Blocks, created by Gilfus and Pittinsky,  which allows third-party developers to create customizations and extensions for Blackboard Learn through open APIs and web services.