I don't know much XML yet, but I was thinking about how the file format is sort of coded in the dtd file. If your .dtd is copyrighted and you don't share, isn't that sort of preventing people from ...

Moving data from one source to another is not all that difficult in the scheme of things. If your source data is a tab-delimited file, for example, and you need it in an SQL relational database, you ...

It is probably safe to assume that the majority of people who use JAXB today use the xjc compiler to create Java classes from XML Schema files rather than from Document Type Definition (DTD) files.