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trace

Provides an execution trace to be used in debugging queries.

The

fn:trace

function accepts items and a label for those items and returns the items unchanged. The exact behavior of the function is implementation-dependent, but generally the processor puts the label and the value of the items in a log file or user console.

Syntax

fn:trace(value, label)

The following table describes the arguments:

Argument	Required/ Optional	Description
value	Required	The items to trace.
label	Optional	A label to display with the trace information.

Return Value

Based on the items and a label for those items, it returns the items unchanged.

Example

Assume that you have the following variable definition:

let $var1 := 5

The following expression returns

The correct value is: 5

as the result:

fn:trace($var1, 'The correct value is: ')

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Design

Design

trace

trace

Syntax

Return Value

Example