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exists

The exists function in XQuery is used to determine whether a sequence contains one or more items.

fn:exists(arg)

The following table describes the argument for this command:

Argument	Required/ Optional	Description
arg	Required	The sequence to check for existence. It can be a node, an atomic value, or a sequence of items. It can contain zero or more items.

If the value of

$arg

is not the empty sequence, the function returns

true

. Otherwise, the function returns

false

The following table lists some sample values and return values:

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