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The specifications below belong to the series 'xpath'

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XPath 3.0 (renamed from XPath 2.1 to align with the family of "3.0" specifications) is an expression language that allows the processing of values conforming to the data model defined in [XQuery and XPath Data Model (XDM) 3.0]. Some of the important new features since XPath 2.0 are:

Literal function items, inline functions, dynamic function invocations, and function item coercion
Clarification of rules associated with sequence type matching
let expressions
EQNames (QNames with a namespace URI instead of a namespace prefix)
Support for union types in casting and function arguments