SAX RFD: ModSAX Predefined Features
James Clark
jjc at jclark.com
Mon Mar 8 02:04:22 GMT 1999
David Megginson wrote:
> The parser may throw an exception for either of two reasons:
>
> 1. it cannot validation; or
>
> 2. it does not recognise the property.
>
> If the application wants to determine which of the two is the case,
> then it can try the following:
>
> try {
> parser.setFeature("http://xml.org/sax/features/validation", false);
> } catch (SAXNotSupportedException e) {
> // ...
> }
>
> If the parser throws an exception again, then it does not recognise
> the property name (in other words, it may or may not perform
> validation, and the application has no way to tell); if the parser
> does not throw and exception, then it simply does not support
> validation.
Wouldn't it be simpler to throw different type of exception in these two
cases? You could have a SAXNotRecognizedException that extends
SAXNotSupportedException, and say that parsers should throw
SAXNotRecognizedException when the reason they don't support a feature
is that they do not recognize the feature.
James
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