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Originally posted by mail to the internal XSL WG mailing list as https://lists.w3.org/Archives/Member/w3c-xsl-wg/2014Jul/0052.html (member only) and discussed at F2F Hursley on 30 July 2014. Currently, no specific error code is defined for a situation where xsl:use-package cannot locate or cannot read/load/process the package, but the WG concluded that an error would be needed here.
Error code XTSE3000 has been allocated. I have also added a note that failure to locate a package on which there is a dependency can occur both during static analysis and also at "load/link time" (though I avoid using that term...)