Attributes can be applied to named objects. Attributes are optional. A named object can have no attributes, one attribute, or multiple attributes.
Each attribute has a unique attribute identifier, an attribute syntax, and a set of zero or more distinct attribute values.
XFN defines the base attribute interface for examining and modifying the values of attributes associated with existing named objects. These objects can be contexts or any other type of object. Associated with a context are syntax attributes that describe how the context parses compound names.
The extended attribute interface contains operations that search for specific attributes and that create objects and their associated attributes.