There is
https://www.w3.org/2001/05/serialized-infoset-schema.html
XSV (Schema 1.0 only) [1] produces its error reports using the PSVI
document type defined there, and includes a stylesheet for
converting to HTML.
XSV is old, although I believe the installers linked from the page
below are still viable standalone. If there's interest I might produce
a more up-to-date package...
ht
[1] http://www.ltg.ed.ac.uk/~ht/xsv-status.html
--
Henry S. Thompson, Markup Systems Ltd.
Cavers Garden Farm, Denholm; by Hawick; TD9 8LN
+44 (0) 7866 471 388
Fax: (44) 131 651-1426, e-mail:
URL: http://www.markup.co.uk/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
