Generally XML parsers don't tell the application what kind of quotes were used around an attribute value in an input XML document; therefore XSLT takes the view that the receiving application won't care what kind of quotes were used, and it therefore provides no control over which kind are used in the serialized output.
(I sometimes use this as an example of the kind of feature that no-one would possibly want...)
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Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer\'s Reference
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