The successful application of augmented reality as a guidance tool for procedural tasks like maintenance or repair requires an easily usable way of modeling support processes. Even though some suggestions have already been made to address this problem, they still have shortcomings and don't provide all the required features. Thus in a first step the requirements a possible solution has to meet are collected and presented. Based on these, the augmented reality process modeling language (ARPML) is developed, which consists of the four building blocks (i) templates, (ii) sensors, (iii) work steps and (iv) tasks. In contrast to existing approaches it facilitates the creation of multiple views on a single process. This makes it possible to specifically select instructions and information needed in targeted work contexts. It also allows to combine multiple variants of one process into one model with only a minimum of redundancy. The application of ARPML is shown with a practical example.