Extended properties with Entity Framework or NHibernate


Is there are an easy way to store some of entitie's properties in a column as a bulk, as XML or something? Querieng by those properties of course is not an option, but it still'd be valuble to be able to extend data model without database migration.

For NHibernate you can use dynamic-component http://nhibernate.info/doc/nh/en/index.html#components-dynamic or using the dictionary as a name-value list nhforge.org/doc/nh/en/index.html#collections-mapping or even Duck-Typing http://fabiomaulo.blogspot.com/2009/07/duck-typing-with-nhibernate.html