Use TransformSetParams to directly access the subcomponent that performs the transformation of an XML document into a set of parameter values. When an application calls the SetParams method, this subcomponent converts the XML supplied as the ParamsXml parameter into a data packet, which it then uses to read and store parameter values. These parameter values are later passed to the provider when you call GetDataAsXml. 

If the transformation passed to the SetParams method includes any user-defined nodes, you must supply TransformSetParams with an OnTranslate event handler. 

SetParams 

ProviderName 

OnTranslate 

GetDataAsXml 

Using an XML Document as the Client of a Provider