I want to understand a difference between execution of evaluation when-
(This question could be linked to an issue mentioned in this question.)
XPath is not defined except on namespace-aware source documents. So the simple answer is, anything might happen depending on the implementation.
By constrast, XPath should work regardless of the setting of isValidating, and in nearly all cases should produce the same results. An exception might be the use of the id() function, which depends on ID attributes being recognised.
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