This paper, presented in DH2019, stems from the analysis of multiple poetic resources that were available on-line, as well as the results of methodological discussions with scholars of European Literature. The goal was to retrieve the informational needs of all these different sources in order to build a common data model for European Poetry. Thus, by implementing a reverse engineering method, we have created the Domain Model for European Poetry, which is an important milestone for making existent poetry resources interoperable. In this paper, we will present some of the challenges we encountered while conceptualizing the information relevant to poetic analysis and how we have worked around them.