PHP对XML操作2

<?xml version="1.0" encoding="UTF-8"?><flow name="myflow">	<start name="开始流程" id="xs"/>	<usertask name="发起申请" id="x1">		<from type="start">xs</from>		<true type="usertask">x2</true>		<false type="end">xe</false>	</usertask>	<usertask name="审批" id="x2">		<from type="usertask">x1</from>		<true type="end">x3</true>		<false type="usertask">x1</false>	</usertask>	<end name="流程结束" id="xend"/></flow>