Re: [Geotools-gt2-users] unique id of feature

[<elo...@os...>]

Thank you :) So the namespace is only related to the feature type, but 
can I then assume that a feature ID uniquely identifies a feature across 
all feature types? Or just within the feature type of the feature in 
question? E.g. is feature id = "river:fraser" unique among all feature 
types, or could there be a book or artist (or whatever) also called 
"river:fraser"?

Regards,
Erik Løvlie


Jody Garnett wrote:
> Sort of...
>
> The namespace is really only for GML generation - it should not be 
> part of our feature model but we needed
> to ship software so there it is. In the new feature model this kind of 
> information will be stored with a putClientProperty method.
>
> So the namespace + typeName go together to describe in a unqiue 
> fashion the FeatureType (or schema) to which the Feature belongs.
>
> The FeatureID is supposed to define the feature based on the real 
> world thing (rather than something silly like
> the shapefile row or databse ID key). The OGC Reference Model goes 
> into details (the Fraser river should
> be the Fraser river regardless of what application is working on it 
> and what information they are tracking on it etc..).
> - http://portal.opengeospatial.org/files/?artifact_id=3836
>
> In GeoTools it is up to the datastore to provide a "good" Feature ID. 
> Most of them will pick up on an "ID" column
> of Intergers, some of them will make use of all primary keys etc...
>
> Jody
>> Hi everyone, a really basic question this time:
>>
>> Looking at the documentation and source code for (Default)FeatureType 
>> and (Default)Feature, it seems that a feature is uniquely identified 
>> by its namespace (URI) and feature ID, Feature.getNamespace() and 
>> Feature.getID() respectively. Is this correct?
>>
>>
>> Regards,
>> Erik Løvlie
>>
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