Note there are some developers who have built support for parsing complex
GML features. They just haven't got the go ahead and time to contribute the
code back. Though I'm meeting them today, so will mention that there is
real community interest.
On Mon, Dec 13, 2010 at 9:08 PM, Ben Caradoc-Davies
<ben.caradoc-dav...@csiro.au> wrote:
> Andrew,
>
> there are technical barriers, such as the lack of support for parsing
> complex GML features. WFS-T would require parsing complex features
> before they could be inserted into a database. app-schema is build on
> simple features, and so locking would have to be coordinated with these.
> Furthermore, feature chaining would mean that related features would
> also have to be locked.
>
> The biggest technical problem in my view is that CQL expressions are
> used to implement polymorphism (conditionals) and to construct data in
> the middleware. CQL expressions are in general irreversible. This is a
> huge problem in using the existing mapping as it stands. So perhaps a
> new mapping might be required? (Or a new ORM backend that addresses both
> reversibility and efficiency in one go?)
>
> One conceptual hurdle is object identity and referential integrity. When
> you update a complex feature, are you also updating nested properties,
> or just the top-level feature? What about properties that are shared
> between multiple features (associations)? What about multivalued
> attributes: do you need to garbage collect to preserve foreign key
> constraints?
>
> Sorry, I have more questions than answers. This is an interesting
> problem. :-)
>
> Kind regards,
> Ben.
>
> On 13/12/10 20:02, Andrew Chamberlain wrote:
> > Hi All,
> >
> > We were just sizing up the task of enabling transactions with the
> > app-schema plugin, and were wondering if anyone knew of any major issues
> > which might prevent / trouble the development of this? Questions which
> > immediately come to mind are:
> >
> > 1) Would the current mappings be re-usable, or would a separate set be
> > needed for the reverse (i.e. write) direction?
> > 2) Would such a reverse mapping be possible with the current mechanisms?
> >
> > I'm hoping that the original reason that transactions wasn't implemented
> > was simply a matter of limited time and funds, and not something
> technical.
> >
> > Any thoughts/pointers would be much appreciated.
> >
> > Best regards,
> >
> > Andy
> >
> >
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>
> --
> Ben Caradoc-Davies <ben.caradoc-dav...@csiro.au>
> Software Engineering Team Leader
> CSIRO Earth Science and Resource Engineering
> Australian Resources Research Centre
>
>
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