Report Formats

The Cobertura plugin can produce reports in html and xml formats. You can even get both is you want to. Here's how you would configure that:

<project>
  ...
  <reporting>
    <plugins>
      ...
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>cobertura-maven-plugin</artifactId>
        <configuration>
          <formats>
            <format>html</format>
            <format>xml</format>
          </formats>
        </configuration>
      </plugin>
    </plugins>
  </reporting>
</project>