I've obtained some books in the form of XML files. This XML seems to be output of an Abbyy program (presumably based on OCR of actual books).
I'm looking for software for these files be converted into something readable. I'd prefer PDF output but HTML or e-book formats are OK if it will permit reading the text.
I cannot use anything proprietary or commercial. It must be some OSS ware that works on Linux, preferably from the Ubuntu repository.
Web-searching is useless as it just brings up endless results about either using Abbyy commercial-ware, or converting to XML, or from PDF, or doing OCR.