[xquery-talk] why must one have something inside {} ?

David Lee dlee at calldei.com
Sat Dec 3 11:41:11 PST 2011

Yes exactly !
Function bodies should be able to be empty too ... its so simple !

declare function notimplementedyet() {};

David A. Lee
dlee at calldei.com

-----Original Message-----
From: talk-bounces at x-query.com [mailto:talk-bounces at x-query.com] On Behalf
Of Michael Dyck
Sent: Saturday, December 03, 2011 2:28 PM
To: talk at x-query.com
Subject: Re: [xquery-talk] why must one have something inside {} ?

David Lee wrote:
> I am asking why in *XQuery*  the expression {} is not equivalent to {()}

It might simply be that no-one suggested it.

> Is there a case in *XQuery* where this would be problematic ?

I don't think so.

Probably the least-impact way for the spec to accomplish this would be 
to alter the syntax of EnclosedExpr, from
     EnclosedExpr ::= "{" Expr "}"
     EnclosedExpr ::= "{" Expr? "}"
and then say that, if the Expr is omitted, the EnclosedExpr yields the 
empty sequence. Note that, in addition to element and attribute content, 
this would also take effect when an EnclosedExpr is used as a function 
body, which may or may not be something you'd like as well.


talk at x-query.com

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