How to create index on XMLType column extension?

Question

I have an XMLType column named "info" whose corresponding global element has a complexType "InfoType" in namespace "http://example.org/ord". The "InfoType" complexType is extended in two namespaces, "http://example.org/info/zipcode" and "http://example.org/info/street". How do I create a unique index using an "InfoType" element contributed from one of the extension namespaces?
I have included below a SQL script that completely describes the problem.
Thanks in advance for your assistance?
- Ron
BEGIN
DBMS_XMLSCHEMA.registerSchema(
'chapter04prod.xsd',
'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://example.org/prod"
targetNamespace="http://example.org/prod"
elementFormDefault="unqualified">
<xsd:complexType name="ItemsType">
<xsd:sequence>
<xsd:element name="product" type="ProductType"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="ProductType">
<xsd:sequence>
<xsd:element name="number" type="xsd:integer"/>
<xsd:element name="name" type="xsd:string"/>
<xsd:element name="size" type="SizeType"/>
<xsd:element name="color" type="ColorType"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="SizeType">
<xsd:simpleContent>
<xsd:extension base="xsd:integer">
<xsd:attribute name="system" type="xsd:string"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
<xsd:complexType name="ColorType">
<xsd:attribute name="value" type="xsd:string"/>
</xsd:complexType>
</xsd:schema>',
TRUE,
TRUE,
FALSE,
FALSE);
END;
BEGIN
DBMS_XMLSCHEMA.registerSchema(
'chapter04ord1.xsd',
'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://example.org/ord"
xmlns="http://example.org/ord"
xmlns:prod="http://example.org/prod"
elementFormDefault="qualified">
<xsd:import namespace="http://example.org/prod"
schemaLocation="chapter04prod.xsd"/>
<xsd:simpleType name="OrderNumType">
<xsd:restriction base="xsd:string"/>
</xsd:simpleType>
<xsd:complexType name="InfoType"/>
<xsd:complexType name="CustomerType">
<xsd:all>
<xsd:element name="name" type="CustNameType"/>
<xsd:element name="number" type="xsd:integer"/>
<xsd:element name="info" type="InfoType" form="unqualified"/>
</xsd:all>
</xsd:complexType>
<xsd:simpleType name="CustNameType">
<xsd:restriction base="xsd:string"/>
</xsd:simpleType>
<xsd:element name="order" type="OrderType"/>
<xsd:element name="customer" type="CustomerType"/>
<xsd:complexType name="OrderType">
<xsd:sequence>
<xsd:element name="number" type="OrderNumType"/>
<xsd:element name="customer" type="CustomerType"
maxOccurs="unbounded"/>
<xsd:element name="items" type="prod:ItemsType"/>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>',
TRUE,
TRUE,
FALSE,
FALSE);
END;
BEGIN
DBMS_XMLSCHEMA.registerSchema(
'chapter04infozipcode.xsd',
'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:ord="http://example.org/ord"
xmlns="http://example.org/info/zipcode"
targetNamespace="http://example.org/info/zipcode"
elementFormDefault="unqualified">
<xsd:import namespace="http://example.org/ord"
schemaLocation="chapter04ord1.xsd"/>
<xsd:complexType name="InfoType">
<xsd:complexContent>
<xsd:extension base="ord:InfoType">
<xsd:sequence>
<xsd:element name="zipcode" type="xsd:string"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
</xsd:schema>',
TRUE,
TRUE,
FALSE,
FALSE);
END;
BEGIN
DBMS_XMLSCHEMA.registerSchema(
'chapter04infostreet.xsd',
'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:ord="http://example.org/ord"
xmlns="http://example.org/info/street"
targetNamespace="http://example.org/info/street"
elementFormDefault="unqualified">
<xsd:import namespace="http://example.org/ord"
schemaLocation="chapter04ord1.xsd"/>
<xsd:complexType name="InfoType">
<xsd:complexContent>
<xsd:extension base="ord:InfoType">
<xsd:sequence>
<xsd:element name="street" type="xsd:string"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
</xsd:schema>',
TRUE,
TRUE,
FALSE,
FALSE);
END;
BEGIN
DBMS_XMLSCHEMA.registerSchema(
'chapter04nonamespace.xsd',
'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:ord="http://example.org/ord">
<xsd:import namespace="http://example.org/ord"
schemaLocation="chapter04ord1.xsd"/>
<xsd:element name="info" type="ord:InfoType">
</xsd:schema>',
TRUE,
TRUE,
FALSE,
FALSE);
END;
CREATE TABLE customer (
name VARCHAR(64),
number INTEGER,
info XMLTYPE)
XMLType info STORE AS OBJECT RELATIONAL
XMLSCHEMA "chapter04nonamespace.xsd"
ELEMENT "info";
INSERT INTO customer (name, number, info)
VALUES ('George Jones', 1,
XMLType(
'<info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:street="http://example.org/info/zipcode"
xsi:type="zipcode:InfoType">
<zipcode>28877</zipcode>
</info>');
INSERT INTO customer (name, number, info)
VALUES ('Jim Jones', 2,
XMLType(
'<info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:street="http://example.org/info/street"
xsi:type="street:InfoType">
<street>3456 Autumn Lane</street>
</info>');
SELECT name,
extractValue(info, '/info/street')
FROM customer
WHERE extractValue(info, '/info/street/text()') LIKE '3456%';
-- How does one create a unique index as follows?
CREATE UNIQUE INDEX customer_infostreet ON customer (??????);
-- The following insert should fail with unique index violation!
INSERT INTO customer (name, number, info)
VALUES ('Jerry Jones', 3,
XMLType(
'<info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:street="http://example.org/info/street"
xsi:type="street:InfoType">
<street>3456 Autumn Lane</street>
</info>');

Answer 1

Ron
Glad you found a solution.. However a more efficient solution is show below
SQL> connect sys/ as sysdba
Enter password:
Connected.
SQL> set define on
SQL> --
SQL> define USERNAME = OTNTEST
SQL> --
SQL> def PASSWORD = OTNTEST
SQL> --
SQL> def USER_TABLESPACE = USERS
SQL> --
SQL> def TEMP_TABLESPACE = TEMP
SQL> --
SQL> drop user &USERNAME cascade
  2  /
old   1: drop user &USERNAME cascade
new   1: drop user OTNTEST cascade
User dropped.
SQL> grant connect, resource to &USERNAME identified by &PASSWORD
  2  /
old   1: grant connect, resource to &USERNAME identified by &PASSWORD
new   1: grant connect, resource to OTNTEST identified by OTNTEST
Grant succeeded.
SQL> grant create any directory, drop any directory to &USERNAME
  2  /
old   1: grant create any directory, drop any directory to &USERNAME
new   1: grant create any directory, drop any directory to OTNTEST
Grant succeeded.
SQL> grant alter session, create view to &USERNAME
  2  /
old   1: grant alter session, create view to &USERNAME
new   1: grant alter session, create view to OTNTEST
Grant succeeded.
SQL> alter user &USERNAME default tablespace &USER_TABLESPACE temporary tablespace &TEMP_TABLESPACE
  2  /
old   1: alter user &USERNAME default tablespace &USER_TABLESPACE temporary tablespace &TEMP_TABLESPACE
new   1: alter user OTNTEST default tablespace USERS temporary tablespace TEMP
User altered.
SQL> connect &USERNAME/&PASSWORD
Connected.
SQL> --
SQL> alter session set events ='19027 trace name context forever, level 0x800'
  2  /
Session altered.
SQL> BEGIN
  2  DBMS_XMLSCHEMA.registerSchema(
  3  'chapter04prod.xsd',
  4  '<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://example.org/prod" targetNamespa
fault="unqualified">
  5     <xsd:complexType name="ItemsType">
  6             <xsd:sequence>
  7                     <xsd:element name="product" type="ProductType"/>
  8             </xsd:sequence>
  9     </xsd:complexType>
10     <xsd:complexType name="ProductType">
11             <xsd:sequence>
12                     <xsd:element name="num" type="xsd:integer"/>
13                     <xsd:element name="name" type="xsd:string"/>
14                     <xsd:element name="size" type="SizeType"/>
15                     <xsd:element name="color" type="ColorType"/>
16             </xsd:sequence>
17     </xsd:complexType>
18     <xsd:complexType name="SizeType">
19             <xsd:simpleContent>
20                     <xsd:extension base="xsd:integer">
21                             <xsd:attribute name="system" type="xsd:string"/>
22                     </xsd:extension>
23             </xsd:simpleContent>
24     </xsd:complexType>
25     <xsd:complexType name="ColorType">
26             <xsd:attribute name="value" type="xsd:string"/>
27     </xsd:complexType>
28  </xsd:schema>',
29  TRUE, TRUE, FALSE, FALSE);
30  END;
31  /
PL/SQL procedure successfully completed.
SQL> BEGIN
  2  DBMS_XMLSCHEMA.registerSchema(
  3  'chapter04ord1.xsd',
  4  '<xsd:schema xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns
://example.org/prod" targetNamespace="http://example.org/ord" elementFormDefault="qualified">
  5     <xsd:import namespace="http://example.org/prod" schemaLocation="chapter04prod.xsd"/>
  6     <xsd:simpleType name="OrderNumType">
  7             <xsd:restriction base="xsd:string"/>
  8     </xsd:simpleType>
  9     <xsd:complexType name="InfoType" xdb:SQLType="INFO_TYPE_T"/>
10     <xsd:complexType name="CustomerType">
11             <xsd:all>
12                     <xsd:element name="name" type="CustNameType"/>
13                     <xsd:element name="num" type="xsd:integer"/>
14                     <xsd:element name="info" type="InfoType" minOccurs="1" form="unqualified"/>
15             </xsd:all>
16     </xsd:complexType>
17     <xsd:simpleType name="CustNameType">
18             <xsd:restriction base="xsd:string"/>
19     </xsd:simpleType>
20     <xsd:element name="customers" type="CustomersType"/>
21     <xsd:complexType name="CustomersType">
22             <xsd:sequence>
23                     <xsd:element name="customer" type="CustomerType" minOccurs="0" maxOccurs="unbounded"
24             </xsd:sequence>
25     </xsd:complexType>
26     <xsd:element name="order" type="OrderType"/>
27     <xsd:element name="customer" type="CustomerType"/>
28     <xsd:complexType name="OrderType">
29             <xsd:sequence>
30                     <xsd:element name="num" type="OrderNumType"/>
31                     <xsd:element name="customer" type="CustomerType" maxOccurs="unbounded"/>
32                     <xsd:element name="items" type="prod:ItemsType"/>
33             </xsd:sequence>
34     </xsd:complexType>
35  </xsd:schema>',
36  TRUE, TRUE, FALSE, FALSE);
37  END;
38  /
PL/SQL procedure successfully completed.
SQL> BEGIN
  2  DBMS_XMLSCHEMA.registerSchema(
  3  'chapter04infozipcode.xsd',
  4  '<xsd:schema xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns
//example.org/info/zipcode" targetNamespace="http://example.org/info/zipcode" elementFormDefault="unqualifie
  5     <xsd:import namespace="http://example.org/ord" schemaLocation="chapter04ord1.xsd"/>
  6     <xsd:complexType name="InfoType" xdb:SQLType="ZIPCODE_INFO_TYPE_T">
  7             <xsd:complexContent>
  8                     <xsd:extension base="ord:InfoType">
  9                             <xsd:sequence>
10                                     <xsd:element name="zipcode" type="xsd:string"/>
11                                     <xsd:element name="suffix" type="xsd:string"/>
12                             </xsd:sequence>
13                     </xsd:extension>
14             </xsd:complexContent>
15     </xsd:complexType>
16  </xsd:schema>',
17  TRUE, TRUE, FALSE, FALSE);
18  END;
19  /
PL/SQL procedure successfully completed.
SQL>
SQL> BEGIN
  2  DBMS_XMLSCHEMA.registerSchema(
  3  'chapter04infostreet.xsd',
  4  '<xsd:schema xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns
//example.org/info/street" targetNamespace="http://example.org/info/street" elementFormDefault="unqualified"
  5     <xsd:import namespace="http://example.org/ord" schemaLocation="chapter04ord1.xsd"/>
  6     <xsd:complexType name="InfoType" xdb:SQLType="STREET_INFO_TYPE_T">
  7             <xsd:complexContent>
  8                     <xsd:extension base="ord:InfoType">
  9                             <xsd:sequence>
10                                     <xsd:element name="street" type="xsd:string"/>
11                                     <xsd:element name="suffix" type="xsd:string"/>
12                             </xsd:sequence>
13                     </xsd:extension>
14             </xsd:complexContent>
15     </xsd:complexType>
16  </xsd:schema>',
17  TRUE, TRUE, FALSE, FALSE);
18  END;
19  /
PL/SQL procedure successfully completed.
SQL>
SQL> BEGIN
  2  DBMS_XMLSCHEMA.registerSchema(
  3  'chapter04nonamespace.xsd',
  4  '<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ord="http://example.org/ord">
  5     <xsd:import namespace="http://example.org/ord" schemaLocation="chapter04ord1.xsd"/>
  6     <xsd:element name="info" type="ord:InfoType"/>
  7  </xsd:schema>',
  8  TRUE, TRUE, FALSE, FALSE);
  9  END;
10  /
PL/SQL procedure successfully completed.
SQL>
SQL> CREATE TABLE customer (
  2  name VARCHAR(64),
  3  num INTEGER,
  4  info XMLTYPE)
  5  XMLType info STORE AS OBJECT RELATIONAL
  6  XMLSCHEMA "chapter04nonamespace.xsd"
  7  ELEMENT "info";
Table created.
SQL>
SQL> INSERT INTO customer (name, num, info)
  2  VALUES ('George Jones', 1,
  3  XMLType(
  4  '<info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:zipcode="http://example.org/info/zip
  5     <zipcode>28877</zipcode>
  6     <suffix>s1</suffix>
  7  </info>'));
1 row created.
SQL>
SQL> INSERT INTO customer (name, num, info)
  2  VALUES ('Jim Jones', 2,
  3  XMLType(
  4  '<info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:street="http://example.org/info/stre
  5     <street>3456 Autumn Lane</street>
  6     <suffix>s2</suffix>
  7  </info>'));
1 row created.
SQL> /
1 row created.
SQL> SELECT name,
  2         extractValue(info, '/info/zipcode'),
  3         extractValue(info, '/info/street')
  4    FROM customer
  5  WHERE extractValue(info, '/info/zipcode/text()') LIKE '2%'
  6     OR extractValue(info, '/info/street/text()') LIKE '3456%';
NAME
EXTRACTVALUE(INFO,'/INFO/ZIPCODE')
EXTRACTVALUE(INFO,'/INFO/STREET')
George Jones
28877
Jim Jones
3456 Autumn Lane
NAME
EXTRACTVALUE(INFO,'/INFO/ZIPCODE')
EXTRACTVALUE(INFO,'/INFO/STREET')
Jim Jones
3456 Autumn Lane
SQL>
SQL> CREATE UNIQUE INDEX customer_infozipcode ON customer(
  2  extractValue
  3  (
  4    info,
  5    '/info[@xsi:type="zipcode:InfoType"]/zipcode',
  6    'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  7    xmlns:zipcode="http://example.org/info/zipcode"'
  8  ))
  9  /
Index created.
SQL> select column_name
  2    from user_ind_columns
  3   where INDEX_NAME = 'CUSTOMER_INFOZIPCODE'
  4  /
COLUMN_NAME
SYS_NC00014$
SQL> select INDEX_NAME,COLUMN_EXPRESSION
  2    from user_ind_expressions
  3  /
INDEX_NAME
COLUMN_EXPRESSION
CUSTOMER_INFOZIPCODE
EXTRACTVALUE(SYS_MAKEXML('0341F05603124922B4F6F94DC5E30C2F',4870,"SYS_NC00004$",
SQL> DROP INDEX CUSTOMER_INFOZIPCODE
  2  /
Index dropped.
SQL> desc INFO_TYPE_T
INFO_TYPE_T is NOT FINAL
Name                                      Null?    Type
SYS_XDBPD$                                         XDB.XDB$RAW_LIST_T
SQL> --
SQL> desc ZIPCODE_INFO_TYPE_T
ZIPCODE_INFO_TYPE_T extends OTNTEST.INFO_TYPE_T
ZIPCODE_INFO_TYPE_T is NOT FINAL
Name                                      Null?    Type
SYS_XDBPD$                                         XDB.XDB$RAW_LIST_T
zipcode                                            VARCHAR2(4000 CHAR)
suffix                                             VARCHAR2(4000 CHAR)
SQL> --
SQL> desc STREET_INFO_TYPE_T
STREET_INFO_TYPE_T extends OTNTEST.INFO_TYPE_T
STREET_INFO_TYPE_T is NOT FINAL
Name                                      Null?    Type
SYS_XDBPD$                                         XDB.XDB$RAW_LIST_T
street                                             VARCHAR2(4000 CHAR)
suffix                                             VARCHAR2(4000 CHAR)
SQL> --
SQL> CREATE UNIQUE INDEX customer_infozipcode ON customer(TREAT(INFO.XMLDATA AS ZIPCODE_INFO_TYPE_T)."zipcod
  2  /
Index created.
SQL> select column_name
  2    from user_ind_columns
  3   where INDEX_NAME = 'CUSTOMER_INFOZIPCODE'
  4  /
COLUMN_NAME
TREAT("SYS_NC00007$" AS "ZIPCODE_INFO_TYPE_T")."zipcode"
SQL> select INDEX_NAME,COLUMN_EXPRESSION
  2    from user_ind_expressions
  3  /
no rows selected
SQL> INSERT INTO customer (name, num, info)
  2  VALUES ('Jerry Jones', 3,
  3  XMLType(
  4  '<info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:zipcode="http://example.org/info/zip
  5     <zipcode>28877</zipcode>
  6     <suffix>s1</suffix>
  7  </info>'))
  8  /
INSERT INTO customer (name, num, info)
ERROR at line 1:
ORA-00001: unique constraint (OTNTEST.CUSTOMER_INFOZIPCODE) violated
SQL> INSERT INTO customer (name, num, info)
  2  VALUES ('Jerry Jones', 3,
  3  XMLType(
  4  '<info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:street="http://example.org/info/stre
  5     <street>3456 Autumn Lane</street>
  6     <suffix>s3</suffix>
  7  </info>'))
  8  /
1 row created.
SQL>In you solution a functional index was created. In my case, by breaking the XML abstraction, and using object-relational SQL to create the index (DDL statements are the one case where I feel this is acceptable) I was able to create a pure B-TREE index which has the same effect..