For a special type of XML, you can create a custom framework (which also works in an Oxygen standalone version). Oxygen XML Author plugin already has frameworks for editing DocBook, DITA, TEI, and so on. Their sources are available in the Author SDK. This custom framework is then packed in a zip archive and used to deploy the component.
The following diagram shows the components of a custom framework.
More than one framework can coexist in the same component and can be used at the same time for editing XML documents.
You can add on your custom toolbar all actions available in the standalone Oxygen XML Author plugin application for editing in the Author mode. You can also add custom actions defined in the framework customized for each XML type.
The Author component can also provide the Outline, Model, Elements and Attributes views which can be added to your own developed containers.