An externally visible member is a certain concrete type or exposes certain concrete types through one of its parameters or return value. Currently, this rule reports exposure of the following concrete types:

• A type derived from System.Xml.XmlNode.

A concrete type is a type that has a complete implementation and therefore can be instantiated. To allow widespread use of the member, replace the concrete type with the suggested interface. This allows the member to accept any type that implements the interface or be used where a type that implements the interface is expected.

The following table lists the targeted concrete types and their suggested replacements.

To fix a violation of this rule, change the concrete type to the suggested interface.

It is safe to exclude a message from this rule if the specific functionality provided by the concrete type is required.

Consider passing base types as parameters