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Under 2.3.2 Priming a Stylesheet (http://www.w3.org/TR/xslt-30/#priming-stylesheet), the second paragraph under the second bullet point, the text reads (about initial context items and errors during priming): "The error can be suppressed by use of xsl:try and xsl:catch within the initialization of the variable or parameter." I think it is the reverse: it can be suppressed when the initialization code is wrapped inside an xsl:try and xsl:catch block.
We discussed this in Prague and concluded that the existence of the issue report demonstrates that the text is susceptible to misinterpretation; editor to recast.
The text has been changed to read: The error can be suppressed by use of <elcode>xsl:try</elcode> and <elcode>xsl:catch</elcode> within the sequence constructor used to initialize the variable or parameter. (It cannot be suppressed by use of <elcode>xsl:try</elcode> around a reference to the global variable.)