CPP11 — String extractor semantics undefined?

Summary: CORBA 2.3 added the requirement (1.7 & 1.8) that string extractor
operators be defined for String_var & string member classes, for
example:

std::istream& operator >>(std::istream &, CORBA::String_var &);

However, the semantics of the extractor operations is undefined. Does
the extractor operator extract characters until the first whitespace?
until a newline? until the default width of the stream? until eof?

The same applies to wide strings.

closed/resolved