id Function

Selects elements by their unique ID.

node-set id(object)

Remarks

When the argument is of type node-set, the result is the union of the result of applying id() to the string value of each of the nodes in the node-set argument.

When the argument is of any other type, it is converted to a string and then split into a white space–separated list of tokens (white space is any sequence of characters matching the production); the result is a node-set containing the elements in the same document as the context node that have a unique ID equal to any of the tokens in the list.

The following selects the element with the unique ID "mysample":

id("mysample")

The following selects the fifth para child of the element with unique ID "mysample":

id("mysample")/child::para[position()=5]

See Also

Data Types in Schemas | XDR Schema Data Types Reference | XML Data Types Reference