IEEE Std 1589-2020 pdf download – IEEE Standard for Augmented Reality Learning Experience Model.
5. Activity modeling language for activity scripts Activity scripts hold one activity element each, which contains at least one action step or a sequence of actions steps as the only direct subordinate elements. Since the activity container element defines an obligatory start action, a minimal activity shall contain at least one action referenced in activity metadata as the action to start with (see Figure 2). Each action has the following elements specifying how to handle augmentations and determine the action workflow: a) The mandatory enter and exit elements are responsible for controlling augmentations, messages between devices and to other users, and simple constraint validation (based on if-rules) of user behavior, as follows: 1) Both enter and exit elements may contain activate and deactivate elements, specifying which augmentations and/or actions to launch or remove, respectively. They also define where these augmentations are anchored or what they are attached to in the workplace. 2) Optional messages may specify communication with other devices and/or users. 3) Optional if-rules check observed user behavior, recorded in an experience API endpoint, with the help of a query URL and guide, based on the retrieved results, the branching to other actions. b) The mandatory triggers element contains at least one trigger entry, defining how the user initiates the action’s state change that executes the statements of the exit block and that moves on to the next action step or activity. c) The optional instruction element contains a human-readable title and description to be displayed or read out to the trainee. This element is optional, allowing the creation of action steps that display only augmentations instead of cluttering the display with instructional prompts. It may be replaced by an app element to launch specific web apps or widgets instead.
6. Workplace modeling language The workplace model describes the environment in which the user re-enacts activities, including properties and configuration data of real and virtual resources with which the user interacts. Each workplace model contains a single workplace, which holds all other data (see Figure 3).