Resource Space Model (RSM) is a semantic data model for specifying, storing, managing, and locating versatile resources based on multi-dimensional categorization. However, the structure of the model needs to be extended for managing and searching contents. This paper proposes an extensive model of RSM to solve the problem by building a new layer of RSM to store, manage and search the meaning units of text content, which includes definition meaning unit, cause and effect meaning unit, demonstration meaning unit.