Augmented Reality (AR) promises to provide significant boosts in operational efficiency by making information available to employees needing task support in context in real time. At this time, however, there is no general-purpose conceptual model and data model specification for representing learning activities (also known as employee tasks and procedures) and the learning environment in which these tasks are performed (also known as the workplace). This document proposes an overarching integrated conceptual model that describes interactions between the physical world, the user, and digital information, the context for AR-assisted learning and other parameters of the environment. It defines a first proposal of the two types of required data models, modeling languages, and their binding to XML. Creating such interoperability specification and standard will help to open the market, adding interchangeable component products as alternatives to monolithic Augmented Reality-assisted learning systems. Moreover, it will enable the creation of experience repositories and online marketplaces for Augmented Reality-enabled learning content. Specific attention was given to supporting reuse and re-purposing of existing learning content and to cater to ?mixed? experiences combining real-world learner guidance with the consumption (or production) of traditional contents such as instructional video material or learning apps and widgets.