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From Oleg <ovarak...@googlemail.com>
Subject Re: Query property constraints - How can I join multiple logical operators in any order?
Date Mon, 16 Nov 2009 13:51:46 GMT

Thanks a lot Alex!



Alexander Klimetschek wrote:
> 
> On Mon, Nov 16, 2009 at 10:44, Oleg <ovaraksin@googlemail.com> wrote:
>> What for brackets are allowed in the property constraints to separate
>> logical operators? I want to build e.g. following query statement:
>>
>> //*[(@a = 'value1' and @b = 'value2' or @c = 'value3') and (@d = 'value4'
>> or
>> @e = 'value5')]
>>
>> Is the syntax with round brackets correct?
> 
> Yes.
> 
>> I known that AND has more
>> strength than OR and some brackets are needed sometimes for the right
>> query
>> expression. Right?
> 
> The operator precedence in XPath 1.0 is (from lowest to highest) is:
> or, and, = / !=, <= / < / >= / > [1], hence your "a and b or c"
> (shortened) will be interpreted like "(a and b) or c".
> 
> Personally I always use brackets in any language to avoid any
> mistakes. Leaving them out is just a convenience, after all.
> 
> [1] http://www.w3.org/TR/xpath#NT-OrExpr
> 
> Regards,
> Alex
> 
> -- 
> Alexander Klimetschek
> alexander.klimetschek@day.com
> 
> 

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