DTD changes between 0.0 and 0.1
===============================

- ArticleInfo content changes:
 + ReleaseInfo element has been removed (the version number is now extracted from RevHistory).
 + One and only one Title and SubTitle must occur, and they must be at the START of ArticleInfo
   in this order.
 + An InvPartNumber element has been added to hold a document reference number.
   At most one may occur, and it must follow SubTitle.
 + At most one Abstract may occur, and it must follow InvPartNumber (or SubTitle if no InvPartNumber).
 + One and only one Date and RevHistory must occur, and they must be at the END of ArticleInfo
   in this order.

- Restricted LegalNotice content to only Para

- Added list.class (ItemizedList,OrderedList...), and formal.class
  (Equation|Example|Figure|Table) to Sections and such
