一个flash脚本的有关问题，解决马上给分！

一个flash脚本的问题，解决马上给分！！！
<?xml   version= '1.0 '   encoding= 'big5 '?>
<root>

<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
<record   MediaParentID= "0 "   MediaType= "1 "   MediaDataID= "100 "   MediaFileID= "1001 "   MediaName= "江垫ざ残 "   MediaProtocol= " "   MediaDomain= " "
MediaFilePath= " "   MediaMarquee= " "   > <![CDATA[http://iscom.com.tw/GetCnt.asp?DataID=100&FileID=1001&TableName=vegetable]] </record>
</root>


比如我有以上这么一个xml文件
用flash的XML对象载入以后，如何访问这些节点？
xml.firstChild.childNodes.length等于0啊，晕，不知道处理了？
有知道的朋友帮一下忙，谢谢了


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