XSLT is dumping all source XML. Why?

VERY basic xslt question. I'm trying to get xslt to format a subset of source xml but all the xml is getting displayed and I have no idea why.

here is xml:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="XSLTDC.xsl"?>
<letter xmlns:xlink="http://ift.tt/PGV9lw">   
    <title>Letter from Lionel Cary to Loretta Cary</title>  
    <date>07-05-1906</date> 
    <source>        
        <university>UCLA</university>       
        <library>Powell Library</library>       
        <department>Special Collections and University Archives</department>        
    </source>           
</letter>

here's xslt:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet 
    xmlns:xlink="http://ift.tt/PGV9lw"    
    xmlns:xsl="http://ift.tt/tCZ8VR" 
    version="2.0">
    <xsl:output method="xml"/>
    <xsl:template match="letter/title">
        <xsl:value-of select="."/>
    </xsl:template>
</xsl:stylesheet>

I am getting this:

Letter from Lionel Cary to Loretta Cary 07-05-1906 
UCLA Powell Library Special Collections and University Archives

but my desired result is this:

Letter from Lionel Cary to Loretta Cary