Validating using EPUB version 2.0.1 rules.
ERROR(OPF-052): .../index.opf(90,19): Role value "edc" is not valid.

for
<dc:creator
opf:role="edc"
xml:lang="de">Udo Pisch</dc:creator>

But "edc" is in the list:
https://www.loc.gov/marc/relators/relacode.html
(Editor of compilation)

This message is available at least in epubcheck 3, 4, 5.