When a JAXB provider needs to unmarshal a part of a document into an infoset representation, it first calls this method to create a Result object.

  When a JAXB provider needs to unmarshal a part of a document into an infoset representation, it first calls this method to create a Result object.

A JAXB provider will then send a portion of the XML into the given result. Such a portion always form a subtree of the whole XML document rooted at an element.
Returns: null if the operation fails. The error must have been reported to the error handler.
Parameters:
- errorHandler - if any error happens between the invocation of this method and the invocation of {@link #getElement(Result)}, they must be reported to this handler. The caller must provide a non-null error handler. The {@link Result} object created from this method may hold a reference to this error handler.

  Once the portion is sent to the Result.

  Once the portion is sent to the Result. This method is called by a JAXB provider to obtain the unmarshalled element representation.

Multiple invocations of this method may return different objects. This method can be invoked only when the whole sub-tree are fed to the Result object.
Returns: null if the operation fails. The error must have been reported to the error handler.
Parameters:
- rt - The {@link Result} object created by {@link #createUnmarshaller(ValidationEventHandler)}.

  This method is called when a JAXB provider needs to marshal an element to XML.

  This method is called when a JAXB provider needs to marshal an element to XML.

If non-null, the returned Source must contain a whole document rooted at one element, which will then be weaved into a bigger document that the JAXB provider is marshalling.
Returns: null if there was an error. The error should have been reported to the handler.
Parameters:
- errorHandler - Receives any errors happened during the process of converting an element into a {@link Source}. The caller must provide a non-null error handler.