How can we store reusable XML data

How can we store XML data in Tamino once and use it as many times as we want.
Example: I have a 1000 articles and in all the 1000 articles the copyright and Legal notice is same so I want to store it once and use it whenever I render the articles.
Is this even possible

You would have to include some kind of reference to the common text within the instances.

These references would have to be expanded at the client side
, in a server extension, or in something like the passthru servlet.

Non-proprietary syntaxes for references would be XInclude ( or XLink.(XML Linking Language (XLink) Version 1.1)