DTD Inquisitor 2 DTD Inquisitor is a program originally designed for checking the quality of DTDs. It attempts to locate problematic parts in DTDs. A large number of real world DTDs were downloaded and passed through the DTD Inquisitor. We particularly interested in the structure of the DTDs. The program has components of automata, graphs, some tree transveral and dynamic programming algorithms. These components are commonly used in applications manipulating the DTDs. DTD Inquisitor 2 is a reorganization of the previous distribution aimming to make those components more reusable.