NekoDTD is a configuration that parses Document Type Definition (DTD) files and converts the information into an XML document. This representation can then be processed using standard XML processors and applications to perform grammar analysis, convert the DTD into other grammar formats, etc. The current version of NekoDTD can expose DTD information using DOM or SAX, has the ability to "flatten" DTD files, and can convert existing DTD grammars to XML Schema and Relax NG.