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I would like to join 3 spatial table from oracle spatial database. I use Joiner to create relation between tables. Each table has geometry, I would like to save each of this geometry in separate column in xml. How to map geometry column in oracle spatial reder.I use SeabedML (GML) as writer.

For a GML to accept multiple geometries the geometries have to be aggregated.

So if you use the FeatureMerger instead of the Joiner and set the geometry handling to aggregate you should be fine.

You could name the geometries using the GeometryPropertySetter before merging if you need to be able to identify the parts.

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