The linguistic perspective emphasizes the use of linguistic taxonomy to classify (partition) graphical user interface concepts and elements on several linguistic levels with clearly-defined interfaces between levels. This perspective is based on Nielsen's Virtual Protocol for Interaction that consists of several linguistic levels: goal, pragmatic (task), semantic, syntactical, lexical, alphabetical and physical. A linguistic modeling is modeling the graphical interface by abstracting each linguistic level. The aim of the linguistic modeling is to enhance the maintainability quality of the graphical user interface model as defined in ISO-25010:2011, by enhancing sub-qualities of modularity, analyzability and modifiability. Recent research reported on the linguistic perspective and the linguistic modeling requirements. In this paper, we elaborate more towards a linguistic modeling by modeling the task level; the high abstract level in the linguistic stack. Our contribution is an executable hierarchical task model that fulfils the specific needs towards linguistic modeling.