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- create_format(TableName,Format,^InternalFormat,
	^Status)
- 
	transforms a specified format into an internal 
	format.
 
- read_record(TableName,InternalFormat,AccessType,^VLstream,
	^Status)
- 
	reads all the records in a table or of a set 
	according to "AccessType" in a specified format and returns 
	pairs of RID element and value list in "VLstream".
	The contents of "VLstream" will be buffered, i.e. if 
	"VLstream" is unified with a list cell whose elements are 
	variables, a certain number of records are processed and 
	the variables are unified with the values of the records.
 If all the records are read normally, "Status" will become normal 
	and "Buffer" will become  end.