[xsl] How do you convert a string to a node-set?

["Steve Renshaw" <renshaw_steve at hotmail dot com>]

How do you convert a string to a node-set? Is it possible with MSXSL3?
This doesn't do the trick:
<xsl:variable name="var" 
select="msxsl:node-set('&lt;a&gt;3&lt;/a&gt;&lt;b&gt;4&lt;/b&gt;')"/>

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