RE: [xml-dev] XPath 2.0 Best Practice Issue: Graceful Degradation

["Costello, Roger L." <costello@mitre.org>]

Michael Kay wrote:

> You can check whether validation has been performed using "instance
of"

> if (airplane instance of schema-element(airplane)) then ... 


The if-statement is testing to see if the airplane element conforms to
an XML Schema declaration for the airplane element.  Suppose the test
fails.  Is failure to be interpreted as:

(a) The airplane element did not conform to the airplane element
declaration in the XML Schema.

(b) There was no XML Schema against which to validate the airplane
element.

(c) Both (a) and (b).


Is there a way in XPath 2.0 to distinguish between (a) and (b)?

/Roger