<xml>
<attribute petal:attributes="attr string:0" />
<content petal:content="string:0">yo</content>
replace: <replace petal:replace="string:0">yoyo</replace>
</xml>
<xml>
<attribute petal:attributes="attr string:0" />
<content petal:content="string:0">yo</content>
replace: <replace petal:replace="string:0">yoyo</replace>
</xml>