Delivery channels – How does the Oracle XML Publisher Core engine gets invoked?

Two step publishing method

        Submit a concurrent program of which the Output Format is set to XML
        Submit the XML Report Publisher concurrent request to produce the final output. At submission time, specify the request ID from step 1, choose the desired template and the Output Format (PDF, RTF,…).

   One step publishing method

        Submit a Concurrent Program with the Output Format is set to XML. At submission time select the desired template and the Output Format (PDF, RTF,…). In the background the Output Post Processor (OPP) automatically applies the layout template to the generated XML data file and creates the output file. This method is the most common usage of XML Publisher.

   All other situations

        These delivery channels do not use the concurrent managers but they are web or forms based, where the XML Publisher Core API’s are called directly in JAVA code. No concurrent request is involved and only the XML Publisher Core engine is used. Examples of such situations are the following:
            Pick Slip
            Dunning Letters
            Blanket Agreement (Preview and Print)