possible value-of return values

Hello,

Given the following XML document:
<root>
<user name="Alex" password="Elephant" color=""/>
<user name="Reuter" password="Rhino"/>
</root>
I was wondering if anyone knew the distinction in return values between:
<xsl:value-of select="/root/user[@name='Alex']/@color"/>
And
<xsl:value-of select="/root/user[@name='Reuter']/@color"/>


My guess is they would both be null, but I need to execute logic which
hinges on whether the attribute exists and has a null value OR whether it
exists at all.

Anything you got would be great.

Thanks,

	Alex


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