anddev17_s to answer your question. No, you cannot just convert a JAX-B part class to a SimpleXml part class.
JAX-B and Simple are two different structures. Thus, you need to make changes to the annotation in the existing JAX-B class and put simple equivalent annotations, or you can simply develop a new simple correspondence class see here .!
Learn more about SimpleXml annotations here .!
And there is no exact equivalent for
@XmlRegistry @XmlElementDecl
but here is a detailed explanation of these annotations
It would be easier to answer if you posted the Xml sample, but still you can see here for SimpleXml examples that can shed light on your migration.
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