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Proposed extensions to unary and binary lookup expressions #3

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michaelhkay
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Allows certain common constructs (string literals and variable
references) to appear on the RHS of the lookup operator "?" without
parentheses

Allows certain common constructs (string literals and variable
references) to appear on the RHS of the lookup operator "?" without
parentheses
@ChristianGruen
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A clear +1 from my side!

We noticed as well that it can be painful to explain the difference between $array?($i) and $array($i) even to advanced XQuery users. Code will be better readable if there will be more cases in which the parentheses can be avoided.

@adamretter
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+1 from me too.

Looks good.

Unless I see any objections within a month, I think we can safely merge this. People can always file issues later, after all, these are only proposals at this stage.

@rhdunn Any comments?

@rhdunn
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rhdunn commented Oct 21, 2018

+1 from me as well

No comments at this stage.

@rhdunn
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rhdunn commented Oct 29, 2018

Should this also add QName and URIQualifiedName to the list of unparenthesized items? This way, NCName can be replaced by EQName. This would allow:

$map?point:x
$map?Q{}x

@michaelhkay
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The main purpose of the lookup construct is for easy addressing into JSON structures, and QName-valued keys don't arise in JSON, so I think not.

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4 participants