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See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001AprJun/0216.html
The base64Binary type has no line length restriction on its lexical forms. So it's not a type error if the value contains (for example) 800 characters without any newline sequence. The lexical form of base64Binary data can contain any of the 65 characters in the "Base64 Alphabet", plus any characters recognized by the XML spec as whitespace. occur. An erratum will be created to clarify these rules and illustrate the grammar for the lexical and canonical forms of the datatype. See item E2-9 in the Errata doc.