[xsl] behavior of boolean() when applied to an empty variable

Hello,

The boolean() function behaves in a way I don't understand when given an 
empty variable as argument. I was hoping one of you could explain it to me.
Take the following two variables:

<xsl:variable name="empty1"></xsl:variable>

<xsl:variable name="empty2">
   <xsl:if test="false()">
       <xsl:value-of select=" 'some non-empty string' "/>
   </xsl:if>
</xsl:variable>

The value of both variables is the same, i.e. "", an empty string. 
However, boolean($empty1) returns "false" while boolean($empty2) returns 
"true". Why? I thought that the boolean function can be used to test 
whether a string is empty---that is, I thought that it would return 
"false" in both cases. What am I misunderstanding?
Thanks,
Wolfhart

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