Generally, programs used for web design can convert DTD schema to XML type schema. W3C also offers one command line utility that can convert DTD to XSL.
Convert Document Type Definition format to XML eXtensible stylesheet.
We have found 3 software records in our database eligible for .dtd to .xsl file format conversion.
Microsoft Windows software - convert dtd to xsl on Windows
Industry-leading web authoring and editing software from Adobe
Convert from dtd file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned dtd to xsl. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A dedicated XML editor
Apple macOS / Mac OS X software - convert dtd to xsl on OS X
Mac version of popular web authoring and editing software