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id

id

The id function in XQuery returns a sequence of element nodes with unique IDs matching the specified ID value(s). It retrieves elements based on the values of their

ID

attributes, commonly used for referencing elements defined with

xml:id

or DTD

ID

attributes.

Syntax

fn:id(arg, node)

The following table describes the argument for this command:

Argument	Required/Optional	Description
arg	Required	One or more ID values (space-separated tokens) to locate matching elements.
node	Optional	The node that provides the context for resolving the IDs. Defaults to the root node of the context item if omitted.

Return Value

Returns a sequence of element nodes whose IDs match any of the values in

$arg

.

Returns an empty sequence if no matching IDs are found.

Resolves ID values with respect to the

$contextNode

or context root node if

$contextNode

is omitted.

Additional information

The ID attributes must be declared as type

ID

in the schema or DTD for ID resolution to work.

The

$arg

string(s) can contain one or multiple whitespace-separated ID tokens.

If the context node has no root or relevant attributes, the result may be empty.

XML Documents, URIs and IDs

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