The concat function doesn't work with zero or one parameter

According to the w3 spec...

http://www.w3.org/TR/2002/WD-xquery-operators-20020816/#func-concat

...these should be valid....

<xsl:value-of select="concat()" />
<xsl:value-of select="concat('abc')" />


Is this a known bug or am I interpreting the spec wrong?
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