That is one of my problems: I have no control on the Oracle side. I have to read it as it is and and, if possible, make it work on the PostgreSQL/PostGIS side.

@Albert Godfrind I guess I did that on the original question, didn't I? Aren't they the same as the PostgreSQL database, in the case of PostGIS? If they are not, I'm sorry, I'm still learning about PostGIS and I did not know that. Where can I find it?About Oracle, what are the values of the NLS_DATABASE_PARAMETERS table that I should post?