I'm pretty new to Semantic Mediwiki. Currently I am in the process of setting up a site [1] with a number of different documents types (each document type mapping to an underlying Concept or Category) .

As a way of getting started I am following the Semantic Forms Example [2] which creates Books and Authors and uses the property "Was written by", of type "Page" to link a Book with its Author(s).

What is the best way to create a property that constrains the link just to Authors, e.g. a property "written by", of type "Author" where only Author pages are valid for the "written by" property?

[1] http://halo.3kbo.com/index.php/Enterprise_Software_Release_Process_Prototype

[2 http://www.mediawiki.org/wiki/Extension:Semantic_Forms/Example