“…However, requiring optimal results typically causes for too much time to be taken during detection [6,7]. Therefore, many specific applications have been developed that do not achieve optimal results, and many assumptions are used to inform the semantics of a tree [15,18,19], such as whether the tree is ordered [4,16,17,[20][21][22][23][24] or unordered [5,25,26], or whether the tree is labelled [5,20,25] or unlabelled. Nevertheless, no generalized method can be considered to be the best for tree structure-based difference detection, and as a result, much effort has been expended on finding such a generalized method.…”