The Extended Communities Attribute itself is a transitive optional BGP attribute. An example is the XML attribute xml&colon;lang. To replace the value of an existing attribute, Use the replace keyword. Leaving attribute values unquoted is considered unsafe. The $DATA attribute, which contains file data, is such an example. Constraints make it possible to further restrict the domain of an attribute. These must be understood as being judged relative to a single attribute of goodness. Uniformity is a quality attribute indicating good workmanship. The working directory attribute of this shortcut is ignored. For example, suppose the training data contains a continuous attribute, formula 21. However, people do not attribute equal importance to all dreams. Animation is the change of an attribute over time. Monin interprets this result in terms of attribute substitution. The definition of this Extended Community Attribute is documented in RFC 4360.