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Mode that permits existing objects to be reused and new objects to
be created.
Mode that demands a new object be created and no existing object
should exist.
Default mode; existing objects are reused, new objects are not created
Mode that requires that objects should already exist; new objects cannot
be created.
The core operation: answer a new object constructed according to the
object description hanging from root
, using the assembler
a
for any sub-objects.
Answer (Model) open( this, root, mode )
, unless
the result cannot be or is not a Model, in which case throw an exception.
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