/*
 * 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
 *    Copyright: 2000 Regents of the University of California and the
 *               National Center for Ecological Analysis and Synthesis
 *  For Details: http://www.nceas.ucsb.edu/
 *    File Info: '$Id: xmltables.sql 123 2000-06-07 00:44:37Z jones $'
 *
 */

/*
 * Drop all of the objects in proper order
 */
set echo off

DROP SEQUENCE xml_nodes_id_seq;
DROP SEQUENCE xml_catalog_id_seq;
DROP SEQUENCE xml_documents_id_seq;

DROP TRIGGER xml_nodes_before_insert;
DROP TRIGGER xml_documents_before_insert;
DROP TRIGGER xml_catalog_before_insert;

DROP TABLE xml_index;
DROP TABLE xml_catalog;
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),	-- the unique node id (pk)
	nodeindex	NUMBER(10),	-- order of nodes within parent
	nodetype	VARCHAR2(20),	-- type (DOCUMENT, COMMENT, PI,
					-- ELEMENT, ATTRIBUTE, TEXT)
	nodename	VARCHAR2(250),	-- the name of an element or attribute
	nodedata	VARCHAR2(4000), -- the data for this node (e.g., 
					-- for TEXT it is the content)
	parentnodeid	NUMBER(20),	-- index of the parent of this node
	rootnodeid	NUMBER(20),	-- index of the root node of this tree
	docid		NUMBER(20),	-- index to the document id
	date_created	DATE,
	date_updated	DATE,
   CONSTRAINT xml_nodes_pk PRIMARY KEY (nodeid),
   CONSTRAINT xml_nodes_root_fk 
		FOREIGN KEY (rootnodeid) REFERENCES xml_nodes,
   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 documents
 */
CREATE TABLE xml_documents (
	docid		NUMBER(20),	-- the document id #
	rootnodeid	NUMBER(20),	-- refernce to the root node of the DOM
	docname		VARCHAR2(100),	-- usually the root element name
	doctype		VARCHAR2(100),	-- public id indicating document type
	doctitle	VARCHAR2(1000),	-- title of document if exists
	date_created	DATE,
	date_updated	DATE,
   CONSTRAINT xml_documents_pk PRIMARY KEY (docid),
   CONSTRAINT xml_documents_root_fk 
		FOREIGN KEY (rootnodeid) REFERENCES xml_nodes
);

CREATE SEQUENCE xml_documents_id_seq;

CREATE TRIGGER xml_documents_before_insert
BEFORE INSERT ON xml_documents FOR EACH ROW
BEGIN
  SELECT xml_documents_id_seq.nextval
    INTO :new.docid
    FROM dual;
END;
/

/* 
 * XML Catalog -- table to store all external sources for XML documents
 */
CREATE TABLE xml_catalog (
	catalog_id	NUMBER(20),	-- the id for this catalog entry
	entry_type	VARCHAR2(500),	-- the type of this catalog entry
					-- (e.g., DTD, XSD, XSL)
	source_doctype	VARCHAR2(500),	-- the source public_id for transforms
	target_doctype	VARCHAR2(500),	-- the target public_id for transforms
	public_id	VARCHAR2(500),	-- the unique id for this type
	system_id	VARCHAR2(1000),	-- the local location of the object
   CONSTRAINT xml_catalog_pk PRIMARY KEY (catalog_id)
   -- CONSTRAINT xml_catalog_uk UNIQUE (entry_type, source_doctype, target_doctype, public_id)
);

CREATE SEQUENCE xml_catalog_id_seq;

CREATE TRIGGER xml_catalog_before_insert
BEFORE INSERT ON xml_catalog FOR EACH ROW
BEGIN
  SELECT xml_catalog_id_seq.nextval
    INTO :new.catalog_id
    FROM dual;
END;
/

/* 
 * Index of Nodes -- table to store precomputed paths through tree for 
 * quick searching in structured searches
 */
CREATE TABLE xml_index (
	nodeid		NUMBER(20),	-- the unique node id
	path		VARCHAR2(20),	-- precomputed path through tree
   CONSTRAINT xml_index_pk PRIMARY KEY (nodeid,path),
   CONSTRAINT xml_nodes_fk FOREIGN KEY (nodeid) REFERENCES xml_nodes
);