Sorry, I misread the request. In this case, if I have now understood correctly, you are opening the source before retrieving the layer.
That would then be everything up to the first '|'. For a file-base source the full-filename with path. For a Database-System such as PostGis the Connection-String to connect to the Database (with user/password-information). --- After the connection has been made use GetName or GetLayer as needed from the information supplied after the first '|' to retrieve the layer. When the Layer-Name is unique, GetName should be used - for drivers such as GML and KML, where the Layer-Name may not be unique, Getlayer should be used Mark
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