Adding attributes to elements

A different approach

A separate place Unlike W3C XML Schema, which considers attributes part of the core type, RELAX treats attributes as additional annotation. This makes declaring them a lot easier.
No default value RELAX doesn't modify document information. It only allows you to specify which attributes may or must appear, and the type.
Extensible types You can use W3C XML Schema built-in data types to identify and extend types for elements and attributes, providing tighter control (and equivalent control) over data types from XML 1.0 DTDs.
Attribute pools As with elements, you can create reusable sets of attributes and apply them to multiple uses.