Perhaps I am missing something. You want optional tags, but you don't want
to know whether they were provided?
IE, if your XML file looks like:
<myRoot>
<optionalTag/>
</myRoot>
and another looks like:
<myRoot/>
you don't want to know the difference?
Malachi
On Tue, 26 Aug 2003 08:15:12 +0100, Geoff Bawn <Geoff.Bawn_at_PPA.NHS.UK>
wrote:
> I am fairly new to JAXB and so I am wondering if anybody in the group can
> give me some advice on the best way to update an XML file using JAXB.
>
> In an application I am developing, the XML passes through a number of
> different systems with each system adding data to the original XML file.
> We have a common format (dtd/schema) for the XML file with each system's
> elements being defined as optional.
>
> I was hoping to simply unmarshal the file, do any updating on the content
> object using the set methods, then marshal back to a new version of the
> file.
>
> The problem I am having is that if the XML file does not contain an empty
> tag value for the optional element, then the JAXB set method returns a
> null exception. I can get round this by making the elements mandatory and
> have the original system generate empty element values for all systems,
> but this seems a bit messy.
>
> Another alternative is to create a new version of the file using
> ObjectFactory using the original values e.g.
> newRules.setFormNumber(oldRules.getFormNumber());
> and adding on the new values - but this seems a bit long winded.
>
> Am I missing anything? Can anybody suggest what is the best way to do
> this?
>
>
>
> Geoff Bawn
> Phone (0191) 203-5864
> E-Mail Geoff.Bawn_at_PPA.NHS.UK
> Fax (0191) 203-5264
>
>
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