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Re: [xml-dev] Be careful writing XPath expressions when the XML couldhave non-existent elements

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.


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



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