How can I flag parts of the document to be excluded from translation?

Please excuse the newbie question. My company creates an XML-based documents for print and online training. These documents can be exported to XLIFF for translation in systems such as Trados Studio. To improve our product, we would like to support the following functionality:

  • Authors can flag sections of the document to be included in or excluded from the translation. For context, the full document should still be included in the exported XLIFF file, but there should be some indication to the translator in Trados Studio that a portion should not be translated.
  • Authors can flag sections text to be included in or excluded from the translation. This is just like the functionality above, but for a small text selection such as a single term.

Are there XLIFF tags or attributes that support the functionality I'm describing within Trados Studio?