Select only the NAME of each ATOM:
  <xsl:template match="ATOM">
    <xsl:apply-templates select="NAME"/>
  </xsl:template>
  The select attribute is pretty much the same for 
   xsl:value-of and xsl:apply-templates.
  The select attribute contains an XPath expression relative to the currently matched node.
A raw element name is an XPath expression that selects children of the currently matched node.