Current configuration for elements definied inside a ELEMENT DTD declaration.

Enumerator:
ONE_AND_ONLY_ONE  Current configuration for DTD element content specification signals that it must appear one and only one times.
ZERO_OR_ONE  Current configuration for DTD element content specification signals that it could appear zero or one time.
ZERO_OR_MANY  Current configuration for DTD element content specification signals.
ONE_OR_MANY  Current configuration for DTD element content specification signals that it must appear one up to many times.