Supported Document Types
You can use the main editing pane in Oxygen XML Author Eclipse plugin to edit a large variety of document types. You can see the type of document association by the special icons displayed in the tabs of the editor title bar.
The supported document types include the following:
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XML documents -
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JavaScript documents -
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CSS documents 
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Markdown documents- Additional supported document types include: Text, Java, Properties, Batch, Shell, PowerShell, Dockerfile, and PHP.