Teacher's expertise on using Learning Management Systems (LMS) is tightly coupled to how they design their online courses. The GraphiT project aims to help teachers in specifying of pedagogically sound learning scenarios that can be technically executable for automatically setting-up the related LMS course. We intend to provide teachers with LMS-specific instructional design languages and editors. To achieve this goal, we have to raise the LMS semantics in order to enrich the pedagogical expressiveness of the produced models. We propose a specific LMS-centered approach for abstracting the low-level parameteriza-tions and turning these semantics into higher-level pedagogical building blocks. We present and illustrate our propositions focused on Moodle. In this paper, we focus on the first abstraction level: identifying pedagogical activities according to recurrent uses of Moodle activities.