Hmm, that sounds good.
Can you give me some more details where to look? Is the complex feature support
in Geotools trunk, or on a working branch, or somewhere else in the Geoserver
repository?
> "data with relationships just does not seem to be that common in the GIS
> space"
Funny, at least for navigation data in GDF and similar raw data formats, they
have been all over the place from the very beginning. OpenStreetMap also has
relations.
And from a user point of view, the most obvious relations in geodata are the
incidence relations between nodes and links (e.g. junctions and roads) or the
containment hierarchy for administrative regions.
So if the availability of test data is really a major blocker, I think I could
come up with a simple data model for complex features (pun intended) and fill
it with data compiled from OSM. (And I do not mean a simple relational rehash
of the OSM data model which provides almost no semantics - I'm thinking of a
schema modelling roads, junctions, road and place names and admin hierarchies.)
Regards,
Harald
_____
Von: udig-devel-boun...@lists.refractions.net
[mailto:udig-devel-boun...@lists.refractions.net] Im Auftrag von Jody Garnett
Gesendet: Freitag, 27. März 2009 00:03
An: User-friendly Desktop Internet GIS; Ben Caradoc-Davies
Betreff: Re: [udig-devel] Complex Features
Support is gradually being rolled out.
One of the bottlenecks has been we lack a source of rich data
structures - data with relationships just does not seem to be that common in
the GIS space. As such even though we have the implementation in geotools we
have been able to do no more then write test cases against it.
Ben is the fellow leading the charge - I see he has a few words here:
- http://blog.geoserver.org/2009/03/25/coming-soon-complex-features/
Aside - "complex features" makes sense in contrast to "simple features"
however it has proven very hard for me to get anyone to fund (something to keep
in mind next time you name something!)
As such there are two attempts to rename it:
- "rich features" - see that sounds like something worth funding :-)
unless people figure it already has money .... I hate language
- "community schemas" - this is actually an application of a rich
feature model; but it is something everyone can feel good about funding - after
it supports a community; and literally allows them to agree on a schema to
share information
Ben has been kind enough to create a test dataset in geotools so I can
try out the rich feature model in uDig. This was the major road block in taking
the rich feature model to uDig.
I share your passion for attributes and references; but we need people
to publish data sets that are interesting enough :-) If we want to wrap up
Ben's test dataset for the uDig catalog we can start working on the info tool
now.
Longer term I would like to see an H2 datastore with support for
external keys.
Jody
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