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Oracle® Database SQL Language Reference
11g Release 2 (11.2)

Part Number E17118-03
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XMLSEQUENCE

Note:

The XMLSEQUENCE function is deprecated. It is still supported for backward compatibility. However, Oracle recommends that you use the XMLTABLE function instead. See XMLTABLE for more information.

Syntax

Description of xmlsequence.gif follows
Description of the illustration xmlsequence.gif

Purpose

XMLSequence has two forms:

Because XMLSequence returns a collection of XMLType, you can use this function in a TABLE clause to unnest the collection values into multiple rows, which can in turn be further processed in the SQL query.

See Also:

Oracle XML DB Developer's Guide for more information on this function, and XMLTABLE

Examples

The following example shows how XMLSequence divides up an XML document with multiple elements into VARRAY single-element documents. In this example, the TABLE keyword instructs Oracle Database to consider the collection a table value that can be used in the FROM clause of the subquery:

SELECT EXTRACT(warehouse_spec, '/Warehouse') as "Warehouse"
   FROM warehouses WHERE warehouse_name = 'San Francisco';

Warehouse
------------------------------------------------------------
<Warehouse>
  <Building>Rented</Building>
  <Area>50000</Area>
  <Docks>1</Docks>
  <DockType>Side load</DockType>
  <WaterAccess>Y</WaterAccess>
  <RailAccess>N</RailAccess>
  <Parking>Lot</Parking>
  <VClearance>12 ft</VClearance>
</Warehouse>

1 row selected.

SELECT VALUE(p)
   FROM warehouses w, 
   TABLE(XMLSEQUENCE(EXTRACT(warehouse_spec, '/Warehouse/*'))) p
   WHERE w.warehouse_name = 'San Francisco';

VALUE(P)
----------------------------------------------------------------
<Building>Rented</Building>
<Area>50000</Area>
<Docks>1</Docks>
<DockType>Side load</DockType>
<WaterAccess>Y</WaterAccess>
<RailAccess>N</RailAccess>
<Parking>Lot</Parking>
<VClearance>12 ft</VClearance>

8 rows selected.