2004-03-24 Atsushi Enomoto <atsushi@ximian.com>

2004-03-24  Atsushi Enomoto <atsushi@ximian.com>

	* XmlAttributeCollection.cs : Remove() should throw an exception when
	  target attribute is not included in the collection.
	* XmlDocument.cs : ImportNode() should reject null node.
	* XmlNode.cs : Fixed type of exception for invalid insertion.
	  It should throw an exception not only when the owner document of the
	  reference element is different but its parent element is different.
	  Some error message improvement.

svn path=/trunk/mcs/; revision=24509