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I want to render some data on a map. They are stored as points in my database (PostGIS), each one is associated with a name. I want to render points with the same place name in the same colour.

However, I don't want to put the name of the places directly in my .xml style file. (Too many places)

Do you know how can I do ?

Maybe an idea is to try to return JSON data in OpenLayers js, but I don't know how I can get it. Does GeoServer enable to return JSON to OpenLayers?

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    yes, you are. You should start reading this, this, this and this Commented May 23, 2013 at 20:48

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If you are serving your data with Geoserver, let me suggest that you serve the data as a WMS service.

You can style the data with SLD, and have them labeled, like shown in this article: Labeling

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