Constraints:
In the attribute value, '<' (less than) must be escaped as <.
'&' (ampersand) must be escaped as & otherwise it parse will assume you've started a entity reference.
Attributes are only associated with the start tag.
Attributes cannot be duplicated on the start tag (i.e. have the same name).
They contain "simple" text content -- no elements.
They are unordered.
Examples:
<doc status='final' xmlns:xlink="http://www.w3.org/1999/xlink"> <author xlink:href="http://www.milowski.com">Alex Milowski</author> </doc>