ASCII-only lowercase. OPC part-name equivalence and Default@Extension matching are ASCII case-insensitive; full Unicode toLowerCase() would fold non-ASCII letters (e.g. É → é) that OPC compares verbatim.
Default@Extension
toLowerCase()
É
é
ASCII-only lowercase. OPC part-name equivalence and
Default@Extensionmatching are ASCII case-insensitive; full UnicodetoLowerCase()would fold non-ASCII letters (e.g.É→é) that OPC compares verbatim.