| Classes that implement this interface store information
about objects that carry cardinality information.
In DTDs, cardinality is defined using special characters
('?' for "0 to 1", '+' for "1 or more" and '*' for "0 or more".
XML Schema allows precise definition of the cardinality
by using minimum and maximum of occurences in the
instance document. This is one of the reasons why
it is not possible to create exact DTD representation
of XML Schema grammar.
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