Hi Shobana,
JiBX does not currently support schema validation, though it does
enforce some aspects of schema constraints (making sure that numeric
values match their expected types, that required attributes and elements
are present, and that elements are properly ordered). Both the 1.1 and
2.0 versions of JiBX will work with StAX parsers which can be used for
validating documents. The 2.0 version may also add support for building
validation into Java classes generated from a schema definition.
That said, I'll point out that schema validation is generally highly
overrated. Schema can only express constraints on individual values, not
on the linkages between values. This means that applications generally
need to do their own validation of data from documents which have
already been schema validated. Schema validation also tends to be
expensive in terms of processing time. For all these reasons, schema
constraints are best considered as design-time specifications and
debugging tools rather than something to be checked at runtime.
If you really need full validation right now (and can't wait for a 1.1
version, which should be released by the end of the year), your best
approach is probably to read an input document into a byte array in
memory, then first parse it with a validating SAX parser and then
unmarshal it using JiBX only if the SAX parse is successful. The JiBX
unmarshalling time is likely to be considerably faster than the
validating SAX parse, so this won't actually cost you much more than
just the validation step does in isolation.
- Dennis
Shobana wrote:
Hi,
I am new to JibX. I am going to use JiBX for mapping an xml document
into Java objects. I want to perform schema validation for the xml
document. Is this possible with JibX? If not, is it good to validate
the xml document against schema using DOM parser or SAX parser
(xerces) and use Jibx for
loading values of xml document?Please suggest the best alternative.
Thanks in advance,
Shobana
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