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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: xml-dev-unsubscribe@l... subscribe: xml-dev-subscribe@l... List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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