RAWA, one of Cyan's expert's on Myst canon, has set out a set of guidelines regarding fan-created Ages.

These guidelines, while still in progress, are fairly clear on the do's and dont's of fan Age creation, and their interaction with the stories of the Myst universe.

<blockquote>The Five Rules of Writing, in their most basic form:

1 - Writers must live within the D'ni limitations of Writing.

2 - Writers must not break continuity with previously released D'ni information.

3 - Writers must not reveal "new" information about characters, places, groups, etc. used by Cyan.

4 - Writers must limit "new" information about D'ni society to specific, smaller groups within D'ni.

5 - Writers must not use the intellectual property of others.

</blockquote> The post in its entirety, plus all other related discussion, can be read at the below link, at the Myst Online forums.

<a href="http://www.mystonline.com/forums/viewtopic.php?t=15890" target="_blank">View the full article</a>