Writing large xmltype data to UTL_FILE and setting max row per file

Hey Gurus,
I am trying to create a procedure (in Oracle 9i) that writes out xml data I have created into several xml files (file would probably be to large for one xml file output...I am doing this for 270,000 rows of data), setting the max rows to 1000 rows per file. I know one would have to create a looping contsruct to do this but I am just not adept enough in PL/SQL to figure it out at the moment.
So essentially their would be some sort of loop construct and substr process that creates a file after looping through 1000 rows and then continues the count and creates a another file until all 270 xml files are created. Simple enough right...lol? Well I've tried doing this and haven't gotten anywhere. My pl/sql coding skills are too elementary I am guessing. I've only been doing this for about three months and could use the assistance of a more experienced person here.
Here are the particulars...
This is the xmltype view code that I used to create the xml data.
select XMLELEMENT("macess_exp_import_export_file",
XMLELEMENT("file_header",
XMLELEMENT("file_information")),
XMLELEMENT("items",
XMLELEMENT("documents",
(SELECT XMLAGG(XMLELEMENT("document",
XMLELEMENT("external_reference"),
XMLELEMENT("processing_instructions",
XMLELEMENT("update", name)),
XMLELEMENT("filing_instructions",
XMLELEMENT("folder_ids",
XMLELEMENT("folder",
XMLATTRIBUTES(folder_id AS "id", folder_type_id AS "folder_type_id")))),
XMLELEMENT("document_header",
XMLELEMENT("document_type",
XMLATTRIBUTES(document_type AS "id")),
XMLELEMENT("document_id", document_id),
XMLELEMENT("document_description", document_description),
XMLELEMENT("document_date",
XMLATTRIBUTES(name AS "name"), document_date),
XMLELEMENT("document_properties")),
XMLELEMENT("document_data",
XMLELEMENT("internal_file",
XMLELEMENT("document_file_path", document_file_path),
XMLELEMENT("document_extension", document_extension)
))))from macess_import_base WHERE rownum < 270000))))AS result
from macess_import_base WHERE rownum < 270000;
This is the Macess_Import_Base table that I am creating xml data from
create table MACESS_IMPORT_BASE
MACESS_EXP_IMPORT_EXPORT_FILE VARCHAR2(100),
FILE_HEADER VARCHAR2(20),
ITEMS VARCHAR2(20),
DOCUMENTS VARCHAR2(20),
DOCUMENT VARCHAR2(20),
EXTERNAL_REFERENCE VARCHAR2(20),
PROCESSING_INSTRUCTIONS VARCHAR2(20),
PATENT VARCHAR2(20),
FILING_INSTRUCTIONS VARCHAR2(20),
FOLDER_IDS VARCHAR2(20),
FOLDER_ID VARCHAR2(20),
FOLDER_TYPE_ID NUMBER(20),
DOCUMENT_HEADER VARCHAR2(20),
DOCUMENT_PROPERTIES VARCHAR2(20),
DOCUMENT_DATA VARCHAR2(20),
INTERNAL_FILE VARCHAR2(20),
NAME VARCHAR2(20),
DOCUMENT_TYPE VARCHAR2(40),
DOCUMENT_ID VARCHAR2(64),
DOCUMENT_DESCRIPTION VARCHAR2(200),
DOCUMENT_DATE VARCHAR2(100),
DOCUMENT_FILE_PATH VARCHAR2(200),
DOCUMENT_EXTENSION VARCHAR2(200)
Directory name to write output to "DIR_PATH"
DIRECTORY PATH is "\app\cdg\cov"
Regards,
Chris

I also would like to use UTL_FILE to achieve this functionality in the procedure.

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