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: @param $name The name of the pair whose value is to be retrieved
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: @return the value of specified pair within the given object, or the empty sequence.
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declare function jn:value($o as object(), $name as xs:string) as item()? external;
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: Creates an object from the specified pairs of another given object.
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: Specifically, for each name in $names, if the object $o has a pair with
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: that name, then a copy of that pair is included in the new object.