Attributes can be accessed in similar way as elements : attribute « XPath « XML Tutorial

1. XML Tutorial
2. XPath
3. attribute

"@" is in the front of attribute names.
"@name" matches name attribute of an element.
"data/@color" matches color attribute of data element.


File: Data.xml
<?xml version="1.0"?>
<dog name="Joe">
  <data weight="18 kg" color="black"/>
</dog>

File: Transform.xslt

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

    <xsl:template match="dog">
      <paragraph>
        <b>
          <xsl:text>Dog: </xsl:text>
        </b>
        <xsl:value-of select="@name"/>
      </paragraph>
      <paragraph>
        <b>
          <xsl:text>Color: </xsl:text>
        </b>
        <xsl:value-of select="data/@color"/>
      </paragraph>
    </xsl:template>

</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?><paragraph><b>Dog: </b>Joe</paragraph><paragraph><b>Color: </b>black</paragraph>