Should this project be continued

No, it shouldn't. The main goal was, for me a good idea. It was to use the TEI format and then use the TEI converter to build the final file. I could be a PDF file, EPUB, JSON or LaTeX. There is two main problems

First problem : data loss

The first big problem is that the TEI format does not handle the same type of data that Hdoc provides. For example all digital documents like videos, images or spreadsheet aren't supported. We have to reference the with some figure tag. Which is not the best way to include them there. Plus there is other data that we lose other a conversion (which is normal).

Second problem

The second problem is that the TEI Converter are not "as good" as I expected. Final documents are ugly, don't have any formatting. Also I saw that we don't any that much interesting converter. We can't use the tei2relaxNG or the tei2xsl : it will be pointless.