Re: [xml-dev] Be careful writing XPath expressions when the XML couldhav

[Benito van der Zander <benito@benibela.de>]

Hi,
btw next wednesday I give a talk "Extending XQuery with pattern 
matching" at the Balisage Conference
about a pattern matching replacement for path expressions (similar to 
regexprs) that will raise an exception,
if the elements queried for do not exist.

Best,
Benito


On 07/29/2014 11:43 AM, Costello, Roger L. wrote:
> Hi Folks,
>
> Are you writing XPath expressions?
>
> XPath is embedded in a lot of things: XQuery, Schematron, XSLT, XML Schema. If you are using XML, there is a good chance you are writing XPath expressions.
>
> Heads up!
>
> Failure to take into account the following rule will result in countless headaches and hard-to-detect bugs.
>
> 	Rule: The result of evaluating an XPath expression
> 	that compares a non-existent element against
> 	anything is always false.
>
> More ... http://xfront.com/Be-Careful-Writing-XPath-Expressions-Against-XML-Documents-that-may-have-Non-Existent-Elements.pdf
>
> /Roger
>
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