Changes from CNXML 0.2.1 to 0.3:

Modification
============
Module tag
    -- Att:
       * required version attribute (CDATA)

    -- Contains:
       * may now contain rule
       * may contain objectives tag following the abstract tag


Modification (done)
============
New tag: note
    -- Desc: An "out of line" note to the reader.  Could be a warning,
       point of interest, etc.

    -- Att:
       * optional type attribute (CDATA)
       
    -- Contains:
       * may contain text
       * may contain emphasis
       * may contain link
       * may contain cnxn
       * may contain cite
       * may contain codeline
       * may contain term
       

Modification
============
Remove tag: important


Modification
============
Cnxn tag
    -- Att:
       * optional version attribute (CDATA)


Modification
============
Para tag
     -- Contains:
	* May now contain note
	* May now contain rule


Modification
============
Item tag
     -- Contains:
	* May now contain note
	* May now contain term
	* May now contain rule


Modification
============
Meaning tag
    -- Contains:
       * May now contain equation


Modification
============
Example tag
    -- Contains:
       * May now contain name as optional first tag


Modification
============
New tag: rule
   -- Desc: statement of a rule (theorem, axiom, rule of thumb, etc.)

   -- Att:
      * required id attribute (ID)
      * required type attribute (CDATA)

   -- Contains: (name?, statement+, (para|example)*)
      * May contain optional name tag
      * Must have One or more statement tags
      * May contain zero or more proof tags
      * May contain zero or more example tags


Modification
============
New tag: statement
    -- Desc: statement of a rule

    -- Att: optional id attribute (ID)

    -- Contains: (para|equation)+
       * May contain para
       * May contain equation

       
Modification
============
New tag: proof
    -- Desc: proof or explanation of a rule statement

    -- Att: optional id attribute (ID)

    -- Contains: name?, (rule|para|equation|figure|list)+
       * May contain optional name tags
       * May contain para tags
       * May contain rule tags
       * May contain equation tags
       * May contain figure tags
       * May contain list tags


Modification (done)
============
Section Tag
    -- Contains:
       * may now contain rule


Modification (done)
============
Problem Tag:
    -- Contains:
       * may now contain rule


Modification
============
New tag: objectives
    -- Desc: learning objectives for a module

    -- Att: None

    -- Contains:
       * may contain text
       * may contain list tags
       * may contain codeline tags
       * may contain emphasis tags


Modification (done)
============
Media tag
      -- Att:
      * type may now be any valid mimetype (CDATA)