I am laoding xml data into xmltype table.
using
INSERT INTO xml_table
VALUES (XMLType(bfilename('XMLDIR','Test_xml.xml'),
nls_charset_id('AL32UTF8')));

xml file is of type
<?xml version="1.0"?>
<!DOCTYPE metadata SYSTEM "http://www.esri.com/metadata/esriprof80.dtd">
<metadata xml:lang="en"><Esri><MetaID>{299847D5-3DDC-4375-9469-607DC669DD6E}</MetaID><CreaDate>20091029</CreaDate><CreaTime>12035600</CreaTime><SyncOnce>FALSE</


I need to use DTD validation, also I am trying to access document using HTTPURITYPE() or UTL_HTTP. It is giving this error.
SQL> call UTL_HTTP.set_proxy('proxy.mydomain.com:8080', NULL);

Call completed.

SQL> declare
2 t_result 
3 varchar2(4000);
4 begin
5 t_result := utl_http.request('http://www.fgdc.gov/metadata/fgdc-std-001-1998.dtd');
6 INSERT INTO xml_table
7 VALUES (XMLType(bfilename('XMLDIR','bas_street_segment.xml'),
8 nls_charset_id('AL32UTF8')));
9 end;
10 /
declare
*
ERROR at line 1:
ORA-29273: HTTP request failed
ORA-06512: at "SYS.UTL_HTTP", line 1577
ORA-12545: Connect failed because target host or object does not exist
ORA-06512: at line 5

Is there a way that i have dtd file, fgdc-std-001-1998.dtd on local machine and dtd gets validated when i 
insert the xml without need for oracle to go to internet or dtd validation bypassed without turning it off and xml file stored as it is.
Currently if i turn dtd validation off the file is stored as follows.
<?xml version="1.0" encoding="WINDOWS-1252"?>
<!--<!DOCTYPE metadata SYSTEM "http://www.fgdc.gov/metadata/fgdc-std-001-1998.dt
d">-->
<metadata>
  <idinfo>
I dont want any changes done in xml file at all.
Please help as i need to load xml by weekend.
Thank you for immediate help
siva