The Outline View in MEISE has three different functions. First, it facilitates navigation in large MEI documents by providing an overview of the document’s tree-structure. Second, as in the Properties View it is essential for editing a document because you can build your hierarchical MEI tree using drag and drop in this area, and the graphical results are shown in the Musical Score View. Finally, it offers a quick switch between the sources in the MEI document (if they exist). More detailed information is provided in the section on Using the MEI Score Editor . Every time you select an element (Measure, Note, Rest, Beam, Tie, Slur) in the Outline View via left-clicking, the corresponding element in the Score View will be highlighted in blue so that the user always knows the current location within the document.