 [det]pwp_stream(:Input:input_stream, 
+Output:output_stream, +Context:list)Loads an Xml document from the given Input stream, transforms 
it using the PWP attributes, and writes the transformed version to the 
given Output stream. Context provides initial 
contextual variables and is a list of Name=Value.
[det]pwp_stream(:Input:input_stream, 
+Output:output_stream, +Context:list)Loads an Xml document from the given Input stream, transforms 
it using the PWP attributes, and writes the transformed version to the 
given Output stream. Context provides initial 
contextual variables and is a list of Name=Value.