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The method getReplacementKeys() has to return a collection of keys which the provider has wants to offer. This will be called each time before a OdysseusScript-File is executed (so the list of available keys can change during run-time, if needed). The second method getReplacementValue() finally has to return the value for the given key. It is expected that since the provider provides the key, a value non-null is retured. If the second method return null, OdysseusScript uses an empty string (""). The method is called each time the key is used inside one OdysseusScript file.