IDs are currently declared with a DTD or schema . An element type has mixed content when elements of that type can contain character data, optionally interspersed with child elements. In this case, the types of the child elements can be constrained, but not their order or their number of occurrences. A namespace identifies an XML vocabulary defined within a URN . Namespace references have scope.
All child nodes beneath the node that specifies the namespace inherit that namespace.
This allows nonqualified names to use the default namespace. See also RDF namespace . See also notation . This ensures that the tree structure will match tree structure generated when the document is stored and reloaded. The element object offers a normalize method.