RE: [Geotools-devel] FeatureTypes, Schemas and Tables

[Alvaro Z. <alv...@ho...>]

Ive downloaded Geotools2 B3.
When Im trying to compile, I get two errors:

org.geotools.algoritms.classification package doesnt exists.

Causant is StyleBuilder class.

Is this class needed?

Regards!!!



>From: James Macgill <jr...@ps...>
>To: geo...@li...
>Subject: [Geotools-devel] FeatureTypes, Schemas and Tables
>Date: Tue, 30 Mar 2004 11:14:27 -0500
>
>This is an issue which has come up in recent posts and in yesterdays IRC.  
>There is some confusion here (at lest in my head) so it would be good to 
>get us all on the same page.
>
>To my mind FeatureType = Schema = a definition of a feature, providing the 
>name, number and type of its attributes.
>
>As such a single FeatureType is re-usable and sets of features of that 
>FeatureType could occur in multiple places (e.g. any number of shapefiles 
>and database tables).
>
>However...  As things stand, at least as I understand it, a FeatureType = 
>one specific instance of a dataset.  That is to say, if an identical set of 
>features were to exist both in a shapefile and in a PostGIS database they 
>would have different FeatureTypes.  Is this right?  Is this how things 
>should be?
>
>I mention this now as we are starting to look at being able to create and 
>modify files and tables, so methods like DataStore.createFeatureType(..) 
>will come into existence.  I'd like to get this issue cleared up before we 
>get much further down the line.  It is worth noting that I have a file 
>based perspective on things rather than a database perspective so I know I 
>don't know all the issues (like where table names should be stored...).
>
>Do we need another object in our hierarchy of things?  A DataSet perhaps?  
>i.e. a DataSet = an instance of a set of Features of a specific 
>FeatureType?  This would lead to DataStore.createDataSet(FeatureType type); 
>...  Or is that just another layer of confusion?
>
>All the best
>
>James
>
>
>
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Alvaro Zabala Ordóñez
Ingeniero en Geodesia y Cartografía.
Ingeniero Técnico en Topografía.

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