How can i register my xml file when i have no xsd ?

Question

For given xml data.
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE metadata SYSTEM "http://www.fgdc.gov/metadata/fgdc-std-001-1998.dtd">
<metadata>
<idinfo>
<citation>
<citeinfo>
<origin>MRF</origin>
<pubdate>20040512</pubdate>
file is large this is a sample.
I am inserting using xmltype without registering schema.
using this method,it is working fine.
CREATE TABLE xml_table OF XMLType;
INSERT INTO xml_table
VALUES (XMLType(bfilename('XMLDIR','Test_xml.xml'),
nls_charset_id('AL32UTF8')));
Can you suggest a way to register above xml using below mentioned method given in samples?
BEGIN
DBMS_XMLSCHEMA.registerschema('http://www.oracle.com/person.xsd',
'<schema xmlns="http://www.w3.org/2001/XMLSchema"' ||
' xmlns:per="http://www.oracle.com/person.xsd"'
etc. and
CREATE TABLE foo OF XMLType
XMLSCHEMA "http://www.oracle.com/person.xsd" ELEMENT "person";
Can I register schema for my xml file which does not have xsd format this way, if yes how??
Please suggest.

Answer 1

The main purposes of registering a schema, depending upon how you register it, are to create objects within Oracle to have the XML stored in and to use to validate XML against.
If you are trying to validate the XML, then you need to register the DTD from http://www.fgdc.gov/metadata/fgdc-std-001-1998.dtd. (If possible, I would suggest to convert the DTD to an XSD before registering it given that DTDs are outdated now)
You can find examples of registering schemas in the FAQ at the {forum:id=34} forum. Assuming your DB version meets the requirements, any registration questions should be posted in that forum. You can also search that forum for registerschema and find many examples as well.