4. The method of claim 1 , further comprising: defining an expression including a connection to the external rule engine; and passing the context to the expression, thereby causing the schema document and the context to be transmitted via the connection, and the result to be received via the connection.
4. The method of claim 1 , further comprising: defining an expression including a connection to the external rule engine; and passing the context to the expression, thereby causing the schema document and the context to be transmitted via the connection, and the result to be received via the connection. 6. The method of claim 4 , wherein the context is automatically transmitted to the external rule engine via a remote procedure call, if the expression is triggered.