XSL search and replace from XML

This one's been driving me crazy. I have a target text file which has the following "fields" in it, like this:

Member.Member Name
Member.Member Addr
Member.Member CSZ

... and my XML source looks like:

<letter>
<Fields>
<Standard Field="Member.Member Name" Value="John S." />
<Standard Field="Member.Member Addr" Value="123 Somewhere St." />
<Standard Field="Member.Member CSZ" Value="Some City, USA" />
...
</Fields>
</letter>

I want to replace the "fields" in the target file with xsl. Then I can run the file and the XML through the parser to merge the two. But, my XSL isn't working right. If I add the XSL to my target text file, here's what the target file looks like before the merge:

<?xml version="1.0"?>
<xslt:stylesheet xmlns:xslt="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xslt:template match="/letter">
<xslt:for-each select="Fields/Standard" >
<xslt:if test="/@Field='Member.Member Name'">
<xslt:value-of select="@Value"/> </xslt:if>
<xslt:if test="/@Field='Member.Member Addr'">
<xslt:value-of select="@Value"/> </xslt:if>
<xslt:if test="/@Field='Member.Member CSZ'">
<xslt:value-of select="@Value"/> </xslt:if>
</xslt:for-each>
</xslt:template>
</xslt:stylesheet>

What am I missing? It should find the field in the xml and replace it with what's in the Value attribute. Please help. Thanks.

Sean

<?xml version="1.0"?>
<xslt:stylesheet xmlns:xslt="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xslt:template match="/">
<xslt:for-each select="letter/Fields/Standard" >
<xslt:if test="@Field='Member.Member Name'">
<xslt:value-of select="@Value"/> </xslt:if>
<xslt:if test="@Field='Member.Member Addr'">
<xslt:value-of select="@Value"/> </xslt:if>
<xslt:if test="@Field='Member.Member CSZ'">
<xslt:value-of select="@Value"/> </xslt:if>
</xslt:for-each>
</xslt:template>
</xslt:stylesheet>