I used an Angular.js boilerplate for this task. It comes with two views. I chose Angular because its data binding and built-in ability to loop over data sets were very convenient for displaying and editing all of the available passages. I used an array as my data structure because Angular could handle it very easily and require minimal coding. I considered a tree or graph for my data structure, but parsing and rendering those would have required more time. I did search for libraries to handle that, and I found that someone created a directive to parse and display trees. It looked pretty good, too. If I were to redo this task, I might try that directive. I got part way through handling changing a passage's parent and did not get to hiding the data for each passage in edit mode.