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The XSLT 3.0 specification draft dated, "11 April 2011" in the paragraph "Status of this Document" says, "It has been developed by the W3C W3C XSL Working Group ......" The word W3C here seems to be written twice. A minor editorial correction seems to be needed here. Thanks.
Thanks for this comment, Mukul. The source has now been corrected. As this is a minor typo, I will take the liberty of closing the bug on your behalf.