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. For example, using an XSLT stylesheet, the XML representation of the DTD can be converted to an equivalent XML Schema or Relax NG grammar. The NekoDTD parser configuration is written using the Xerces Native Interface (XNI) that is the foundation of the Xerces2 implementation. This enables you to use NekoDTD with existing XNI tools without modification or rewriting code.