xpath_boolean function

Returns true if the xpath expression evaluates to true, or if a matching node in xml is found.

Syntax

xpath_boolean(xml, xpath)

Arguments

  • xml: A STRING expression of XML.

  • xpath: A STRING expression that is a well formed XPath.

Returns

An BOOLEAN.

The function raises an error if xml or xpath are malformed.

Examples

> SELECT xpath_boolean('<a><b>1</b></a>','a/b');
 true