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level3/core/getinputencoding01, level3/core/getinputencoding03: level3/core/getinputencoding04: Generated encoding string comparison should be case-insensitive, I see nowhere in the spec stating that encoding names not read from a document must be uppercased. Additionally, getinputencoding04 description mentions getXmlEncoding, should be inputEncoding.
From http://www.iana.org/assignments/character-sets The character set names may be up to 40 characters taken from the printable characters of US-ASCII. However, no distinction is made between use of upper and lower case letters. That would suggest that comparison should be case-insensitive as suggested.
Created attachment 110 [details] Makes encoding comparison case-insensitive, metadata, copyright changes