Elmah-Schema is a simple ELMAH configuration XML Schema file originally created by Jeff Lingis. The ELMAH schema can be used to allow IntelliSense in Visual Studio, validate your web.config file or anything in relation to ELMAH's XML configuration format.
To use Elmah.xsd place it anywhere in your project, then add the following attribute to the elmah element:
<elmah xmlns="http://Elmah.Configuration">
</elmah>