文件存放路径：C:\workspace\robotframework\test_rf_api\testdata\XML.xml
文件内容：
<example>
<first id="1">text</first>
<second id="2">
<child/>
</second>
<third>
<child>more text</child>
<second id="child"/>
<child><grandchild/></child>
</third>
<html>
<p>
Text with <b>bold</b> and <i>italics</i>.
</p>
</html>
</example>