http://ayende.comAyende @ RahienCopyright (C) Ayende Rahien 2004 - 2021 (c) 202660You might be able to include an inline schema and derive from the base type (the one defining "class"). This is not necessarily easy to do, and certainly not a lot of fun, but may work. http://ayende.com/2229/adding-additional-information-to-xml-files-conforming-to-a-schema#comment2http://ayende.com/2229/adding-additional-information-to-xml-files-conforming-to-a-schema#comment2Sun, 18 Mar 2007 12:55:41 GMTIt doesn't look like the NHibernate schema can be easily extended without modification of the original schema. If a schema is designed to be extended, it includes <xs:any namespace="##any"/> and <xs:anyAttribute namespace="##any"/> in the complexType definition. As far as I know, this is the only mechanism that will not causing XML Schema validators to fail if your modifications are present, but the validator doesn't have a definition for your additions. http://ayende.com/2229/adding-additional-information-to-xml-files-conforming-to-a-schema#comment1http://ayende.com/2229/adding-additional-information-to-xml-files-conforming-to-a-schema#comment1Sun, 18 Mar 2007 03:18:47 GMT