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Oracle® Database SQL Reference
10g Release 1 (10.1)

Part Number B10759-01
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EXTRACT (XML)


Syntax

extract_xml::=
Description of extract_xml.gif follows
Description of the illustration extract_xml.gif


Purpose

EXTRACT (XML) is similar to the EXISTSNODE function. It applies a VARCHAR2 XPath string and returns an XMLType instance containing an XML fragment. The optional namespace_string must resolve to a VARCHAR2 value that specifies a default mapping or namespace mapping for prefixes, which Oracle Database uses when evaluating the XPath expression(s).


Examples

The following example extracts the value of the /Warehouse/Dock node of the XML path of the warehouse_spec column in the sample table oe.warehouses:

SELECT warehouse_name, EXTRACT(warehouse_spec, '/Warehouse/Docks')
   "Number of Docks"
   FROM warehouses
   WHERE warehouse_spec IS NOT NULL;

WAREHOUSE_NAME       Number of Docks
-------------------- --------------------
Southlake, Texas          <Docks>2</Docks>
San Francisco             <Docks>1</Docks>
New Jersey                <Docks/>
Seattle, Washington       <Docks>3</Docks>

Compare this example with the example for EXTRACTVALUE , which returns the scalar value of the XML fragment.