Yes Charles
Linked CCs and Mapped CCs are the same thing and I should get out of the habit of calling them 'Linked' rather than 'Mapped'. Whatever you want to call them, they have benefits and drawbacks when compared with Custom DocProps + fields.
Benefits: Can update metadata directly on the page, Updates on the page instantly, Can be easily locked/protected on the page.
Drawbacks: Doesn't work with doc format, May not work on Mac versions of Word

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Andrew Lockton
Chrysalis Design, Melbourne Australia