3 Backwards-incompatible changes to DocBook that are planned for V5.0:
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5 - The Coords attribute will be removed from AreaSet.
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7 - ArtHeader will be dropped from BiblioEntry
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9 - Contents attribute will be removed from BookInfo and SetInfo
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11 - The %indexdivcomponent.mix; will be restricted. Numbered figures
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12 and other elements inappropriate for an Index or SetIndex will be
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15 - RevHistory will be removed from GlossTerm
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17 - Constant Class will be removed from SystemItem
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19 - Graphic and InlineGraphic will be removed
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