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XQuery: Simplify `descendant-or-self` steps #2223

Closed ChristianGruen closed 1 year ago

ChristianGruen commented 1 year ago

Subsequent descendant-or-self steps can be merged if the second node test matches the first, or is more specific, and if no positional predicates are used:

descendant-or-self::node() / descendant-or-self::*
→ descendant-or-self::*