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5 Unleashing the potential of the Internet of Things

– Enrolment policy: The enrolment policy contains the rules of allowance for the web-
enabled things. The WoT-EN FE manages the enrolment policy according to the changes of
related entities such as the WoT service, service providers, users, etc.

– Enrolment management: The WoT-EN FE has the capability for registration and
management of the submitted web-enabled things to the resource information repository.
The changes on the information and the context of the registered web-enabled things induce
change of information of the resource information repository. The WoT-EN FE
re-examines the changed web-enabled things with enrolment policy rules. It means that the
WoT-EN FE can remove the registered web-enabled things beforehand from the resource
information repository. The WoT-EN FE can allow the blocked WoT service to register in
the repository if those are acceptable based on the changed enrolment policy.
8.3.4 WoT description management functional entity (WoT-DM FE)

The WoT-DM FE provides a description method and it manages all description information related
to things. Also, it provides capabilities for translating descriptions among the WoT services.
There are many kinds of things that exist and all things need a mechanism to describe themselves
and their services to be (automatically) discovered and used on the web. There are many description
methods to utilize describing things such as web service description language (WSDL), resource
description framework in attributes (RDFa), microformat, device profile for web services (DPWS)
metadata, SensorML, JSON, etc. The WoT-DM FE provides the capability of description
translation to cooperate among the many description methods and models supported by the different
service providers.

9 Web resource functions
9.1 WoT broker functions
The WoT broker functions have a role for integrating and exposing the devices to the web. To
expose and use physical devices on the web, a web server supporting the HTTP is implemented on
the devices. However, every device does not satisfy these conditions because of constraints.
The WoT broker functions support communication between users of the WoT (e.g., the web clients,
applications) and fully-fledged devices as well as constrained devices. The WoT broker functions
enable the seamless integration of a device onto the web. The agent of the WoT broker has a role to
control and communicate with physical devices.

Figure 7 – Overview of WoT broker function architecture

802 Rec. ITU-T Y.4414/H.623 (11/2015)