/*
 * xmltables.sql -- Create or replace tables for storing XML in the db
 *
 *      Purpose: creates tables needed for XML database
 * 
 *      Created: 12 September 1999
 *       Author: Matt Jones
 * Organization: National Center for Ecological Analysis and Synthesis
 *      Version: '$Id: xmltables.sql 20 2000-04-11 18:22:35Z jones $'
 *
 */

/*
 * Drop all of the objects in proper order
 */
DROP SEQUENCE xml_nodes_id_seq;
DROP TRIGGER xml_nodes_before_insert;
DROP TABLE xml_documents;
DROP TABLE xml_nodes;

/* 
 * Nodes -- table to store XML Nodes (both elements and attributes)
 */
CREATE TABLE xml_nodes (
	nodeid		NUMBER(20),
	parentnodeid	NUMBER(20),
	nodetype	VARCHAR2(2000),
	nodename	VARCHAR2(2000),
	nodedata	VARCHAR2(2000),
	date_created	DATE,
	date_updated	DATE,
   CONSTRAINT xml_nodes_pk PRIMARY KEY (nodeid),
   CONSTRAINT xml_nodes_parent_fk 
		FOREIGN KEY (parentnodeid) REFERENCES xml_nodes
);

CREATE SEQUENCE xml_nodes_id_seq;

CREATE TRIGGER xml_nodes_before_insert
BEFORE INSERT ON xml_nodes FOR EACH ROW
BEGIN
  SELECT xml_nodes_id_seq.nextval
    INTO :new.nodeid
    FROM dual;
END;
/

/* 
 * Documents -- table to store XML document catalog
 */
CREATE TABLE xml_documents (
	docid		NUMBER(20),
	rootnodeid	NUMBER(20),
	docname		VARCHAR2(1000),
	doctype		VARCHAR2(1000),
	date_created	DATE,
	date_updated	DATE,
   CONSTRAINT xml_documents_pk PRIMARY KEY (docid),
   CONSTRAINT xml_documents_root_fk 
		FOREIGN KEY (rootnodeid) REFERENCES xml_nodes
);