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
>
> _______________________________________________________________________
>
> XML-DEV is a publicly archived, unmoderated list hosted by OASIS
> to support XML implementation and development. To minimize
> spam in the archives, you must subscribe before posting.
>
> [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/
> Or unsubscribe:
> subscribe:
> List archive: http://lists.xml.org/archives/xml-dev/
> List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
>
