
 
        Creates an 
MLet instance initialized with attributes read
 from an 
MLET tag in an MLet text file.
        
        
Parameters:
 - 
url - The URL of the MLet text file containing the
 
MLET tag.
 - 
attributes - A map of the attributes of the 
MLET tag.
 The keys in this map are the attribute names in lowercase, for
 example 
codebase.  The values are the associated attribute
 values.
 - 
types - A list of the TYPE attributes that appeared in nested
 <PARAM> tags.
 - 
values - A list of the VALUE attributes that appeared in nested
 <PARAM> tags.