Preload a program from a file
@param filename The program base file name
@param baseDirectory The directory containing the program file
@param encoding The encoding expected in the source file ornull if it is the platform's default encoding
@return The loaded program
@exception LanguageException If an error occurs during loading
If the openjpa.MetaDataRepository plugin value Preload=true is set, this method will load all MetaData for all persistent classes and will remove locking from this class.
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