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In 3.5.3.6 (in a Note) appears the example <xsl:variable name="get-order" select="key('orders-key', ?, /)"/> with the implication that this can be used as a global variable declaration in a library package. However, it will fail because it references the global context item (via "/").
The WG decided this problem could be classed as editorial, and asked the editor to fix it. This he has done.