  The World Wide Lab (WWL) connects the Digital Shadows (DSs) of processes,
products, companies, and other entities allowing the exchange of information
across company boundaries. Since DSs are context- and purpose-specific
representations of a process, as opposed to Digital Twins (DTs) which offer a
full simulation, the integration of a process into the WWL requires the
creation of DSs representing different aspects of the process. Human-Robot
Collaboration (HRC) for assembly processes was recently studied in the context
of the WWL where Behaviour Trees (BTs) were proposed as a standard task-level
representation of these processes. We extend previous work by proposing to
standardise safety functions that can be directly integrated into these BTs.
This addition uses the WWL as a communication and information exchange platform
allowing industrial and academic practitioners to exchange, reuse, and
experiment with different safety requirements and solutions in the WWL.
