Github user afs commented on the pull request:
https://github.com/apache/jena/pull/132#issuecomment-206374357
For now, I think that "local locale" is the best single choice because if
the user wants the XSD standard form "1.23" they can workaround it with a call
`str()` and print a string. Not perfect but gives them a way.
XSD F&O v3.1 has "picture strings" :
https://www.w3.org/TR/xpath-functions-3/#dt-picture-string : that looks like
Java DecimalFormat, not printf style.
I think most people are familiar with printf and things like padding
strings and alignment are covered. We can refine the capabilities after the
machinery is in.
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