Changing tags of a xml based on a dtd

[Cleplecix]

I'm working with this xml\[code\] <?xml version="1.0"?> <globalcoverage> <carrier> <Data>CONTINENT</Data> <Data>COUNTY</Data> <Data>OPERATOR</Data> <Data>FREQUENCY</Data> <Data>SIGNATURE</Data> <Data>GSM</Data> <Data>GPRS</Data> <Data>3G</Data> <Data>PAYMENT</Data> <Data>SMS</Data> <Data>ZONE</Data> <Data>STATUS</Data> </carrier> <carrier> <Data>AFRICA</Data> <Data>ZAMBIA</Data> <Data>MTN Zambia</Data> <Data>GSM 900</Data> <Data>2006-08-14</Data> <Data>X</Data> <Data>X</Data> <Data>X</Data> <Data>X</Data> <Data>X</Data> <Data>NA</Data> <Data>0</Data> </carrier>...\[/code\]It has a lot more records, I want to change the tags, but don't want to do it one by one. There is a way to do it with oxygen using this dtd?\[code\]<?xml version="1.0" encoding="UTF-8"?><!ELEMENT coverturamundial (item+) ><!ELEMENT item (continent, county, operator, frequency, signature, gsm, gprs, _3g, payment, sms, zone, status) ><!ELEMENT continent (#PCDATA) ><!ELEMENT county (#PCDATA) ><!ELEMENT operator (#PCDATA) ><!ELEMENT frequency (#PCDATA) ><!ELEMENT signature (#PCDATA) ><!ELEMENT gsm (#PCDATA) ><!ELEMENT gprs (#PCDATA)><!ELEMENT _3g (#PCDATA) ><!ELEMENT payment (#PCDATA) ><!ELEMENT sms (#PCDATA) ><!ELEMENT zone (#PCDATA) ><!ELEMENT status (#PCDATA)>\[/code\]In fact, the data was taken from a xls. Thanks for your help.