Logical in Count function

First I would like to thank for the first help.

I still have anohter question how to use logical and,
or in Count function.  I wrote 
<p>Employee Count: <xsl:value-of
select="count(/dsWMSRpt/WMSReport[Person_x0020_Name!='Vacancy']
and /dsWMSRpt/WMSReport[Person_x0020_Name!=''])"/></p>

and I got an error.  Am I wrong to use logical and in
it?  Please correct for me.
Thanks

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