You can open any existing XML file in InCopy for editing and tagging.
You can import Ruby used in XML files when the Ruby is compliant with the W3C standard Ruby definition and uses the InDesign namespaces. InDesign uses the following namespaces. xmlns:aid="http://ns.adobe.com/AdobeInDesign/3.0/_ver3.0"
You can save XML files as InCopy stories.