4.4.1 p:xpath-context

[[
In an XPath 1.0 implementation, if the context node is bound to
p:empty, or is unbound and the default readable port is undefined, an
empty document node is used instead as the context. In an XPath 2.0
implementation, the context item is undefined.
]]

I'm not sure to understand why for XPath 2.0, the context item is
undefined (instead of an empty sequence)

Mohamed

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