2002-09-12 DTD update

The following changes have been made to the DTD in the 2002-09-12 update. See also the change log.

The following changes are to allow better markup of multiple choice question (MCQ) documents.

1. feedback

feedback has been given an optional type attribute.

2. question, answer and feedback

An optional p (paragraph) has been included in the content models of question, answer and feedback to allow better markup of items with multiple paragraphs. The p is optional for backward compatibility.

The following changes have been made mainly to allow better markup of events, such as calendars of events or details of abstract collections from conferences.

1. eventgroup

A container element called eventgroup has been created and replaces event in bookdetails and reference. eventgroup has also been added to the %bodytext; parameter entity and so occurs in section, subsection, summary and header.

2. event

The following changes have been made to event:

event has been added to the %data; parameter entity and so occurs in more places.
subjectgroup can occur in event.
event has been given an optional type attribute.

The following change has been made to improve handling of special character entities.

1. symbol

symbol has been given an optional filename attribute.

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