2004-05-12 Atsushi Enomoto <atsushi@ximian.com>

2004-05-12  Atsushi Enomoto <atsushi@ximian.com>

	* XmlDataDocument.cs : Radical design change.
	  - GetElementFromRow() must return "detached" element, even if it is
	    not added to table's Rows.
	  - Introduced XmlDataElement class to map element (this class itself)
	    and DataRow _always_ . It is impossible to map *all* DataRows
	    to/from elements only in XmlDataDocument API, since DataRow can
	    be created separate from it (i.e. by table.NewRow()).
	  - Removed unreliable GetElementsByTagName() dependency from most
	    of the code, since users might create elements that has the same
	    name of any tables (that is possible especially unmapped elements).
	  - Adding/Removing delegates on every event action is unnecessary.
	    Use just flags.
	  - For Load(), just using base.Load() will do most of the job.
	  - Attributes and SimpleContents are not handled properly.

	  "Removed" and "Rollback" events are still TODO.

svn path=/trunk/mcs/; revision=27194