解析XML问题

<?xml version="1.0" encoding="UTF-8"?>
<Document>
<CommercialDraftRegisterConfirmation>
<MsgId>
<Id>String</Id>
<CreDtTm>2001-12-17T09:30:47</CreDtTm>
</MsgId>
<OrgnlMsgId>
<Id>String</Id>
<CreDtTm>2001-12-17T09:30:47.0Z</CreDtTm>
</OrgnlMsgId>
<ComrclDrft>
<IdNb>000000000000000000000000000000</IdNb>
<IsseAmt Ccy="CNY">3.14</IsseAmt>
</ComrclDrft>
<BizCtrlInf>
<PrcCd>String</PrcCd>
<PrcMsg>String</PrcMsg>
</BizCtrlInf>
</CommercialDraftRegisterConfirmation>
<CntrlBkSgntr>String</CntrlBkSgntr>
</Document>
那位大侠帮小弟我搞定下
解析上面的MXL文件
设置root 为XML根节点;