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    The persistence_2_0.xsd enforces the order of the elements in the xml. Re-ordering them makes then error go away.

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Content is not allowed in prolog.
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Content is not allowed in prolog.
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cvc-complex-type.2.4.b: The content of element 'poll' is not complete. One of '{"http://www.mulesoft.org/schema/mule/core":annotations, "http://www.mulesoft.org/schema/mule/core":abstract-message-processor, "http://www.mulesoft.org/schema/mule/core":abstract-outbound-endpoint, "http://www.mulesoft.org/schema/mule/core":abstract-mixed-content-message-processor}' is expected.
org.xml.sax.SAXParseException: Content is not allowed in prolog.	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(UnknownSource)