[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XPath 2.0 Best Practice Issue: Graceful Degradation
Costello, Roger L. wrote: > Excellent discussion! > > Consider this XPath statement: > > if (//airplane[@tailnum='C3H1'] instance of > schema-element(airplane)) then > //airplane[@tailnum='C3H1']/altitude * .3048 > else > if (//airplane[@tailnum='C3H1']/altitude[@unit='feet'] castable > as xs:double) then > //airplane[@tailnum='C3H1']/altitude * .3048 > else > 'Error' > One thing I think we need to clarify here, is that the above itself is not just an XPATH statement. It's a mix of XPATH and a logical structure of another language like XQuery, XSLT or something else. XPATH it self can do some AND/OR/NOT logic, but not if-then-else logic. So what we are really talking about is XPATH Expressions for selection and existance of boolean values, along with another language to provide the if-then-else logic that XPATH doesn't have.
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