Re: Error and Fatal Error

On 17 Jul 2011 10:21, "Mukul Gandhi" <gandhi.mukul@gmail.com> wrote:
> Here are some excerpts from XML specification itself.
>
> <quote>
> error: A violation of the rules of this specification; results are
> undefined. Unless otherwise specified, failure to observe a
> prescription of this specification indicated by one of the keywords
> MUST, REQUIRED, MUST NOT, SHALL and SHALL NOT is an error. Conforming
> software MAY detect and report an error and MAY recover from it.
>
> fatal errors: An error which a conforming XML processor MUST detect
> and report to the application. After encountering a fatal error, the
> processor MAY continue processing the data to search for further
> errors and MAY report such errors to the application. In order to
> support correction of errors, the processor MAY make unprocessed data
> from the document (with intermingled character data and markup)
> available to the application. Once a fatal error is detected, however,
> the processor MUST NOT continue normal processing (i.e., it MUST NOT
> continue to pass character data and information about the document's
> logical structure to the application in the normal way).
>
> well-formedness constraint: Violations of well-formedness constraints
> are fatal errors.
> </quote>
>
> Here are few examples of "errors" and "fatal errors" from the XML spec itself.
>
> examples of "errors",
>
> <quote>
> 1) This specification does not give meaning to any value of xml:space
> other than "default" and "preserve". It is an error for other values
> to be specified; the XML processor MAY report the error or MAY recover
> by ignoring the attribute specification or by reporting the
> (erroneous) value to the application. Applications may ignore or
> reject erroneous values.
> 2) It is an error if an attribute value contains a reference to an
> entity for which no declaration has been read.
> </quote>
>
> examples of "fatal errors",
>
> <quote>
> 1. It is a fatal error for a TextDecl (i.e <?xml' VersionInfo?
> EncodingDecl S? '?>) to occur other than at the beginning of an
> external entity.
> 2. It is a fatal error if an XML entity is determined (via default,
> encoding declaration, or higher-level protocol) to be in a certain
> encoding but contains byte sequences that are not legal in that
> encoding.
> </quote>
>
> I hope this is helpful.
>
> On Sat, Jul 16, 2011 at 9:17 PM, Joe Fawcett <joefawcett@hotmail.com> wrote:
>> Dear List Members
>> I'm writing a short introduction to XML and would like to have a good
>> example of each of the above that doesn't require too much background
>> knowledge. So far I've covered the basics of a well-formed document,
>> creating elements and attributes. I've shied away from the intricacies of
>> DTDs as they are covered in a separate article. Namespaces are also to
>> be covered later so any examples would preferably be unrelated to either of
>> these two areas.
>> According to the XML specification a processor may recover from an error
>> that's not described as fatal although in my experience most parsers don't
>> try to do this, would I be wrong here? - and if so what would an example be
>> for something like Saxon or one of the netter known parsers?
>> Thanks
>
>
>
>
>
> --
> Regards,
> Mukul Gandhi