Cart
[Home] [By Thread] [By Date] [Recent Entries]
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.
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] |
