using a string to generate an XPath

hey guys, 

I'm sure its been mentioned before but....

Are there any plans to add the ability to add the ability specify an xpath
via a string? Something along the lines of:

<xsl:variable name="somepath">/foo[@bar =
'yes']/dingle/dangle</xsl:variable>
<xsl:apply-templates select="path($somepath)" />

It also seems to me that it would be worth while to have an equivilant
testing function:
<xsl:variable name="somepath">foo[@bar = 'yes']</xsl:variable>
<xsl:if  test="test(., $somepath)" />

Just some random thoughts. 

Adam van den Hoven
Internet Software Developer
Blue Zone
tel. 604 685 4310 ext. 260
fax 604 685 4391

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