| @analog(optional)Contains a reference to a field or element in another descriptive encoding system
                              to
                              which this MEI element is comparable.
                           Value of datatype string .
                           att.bibl | 
                  
                     | @authURI(optional)The web-accessible location of the controlled vocabulary from which the value is
                              taken.
                           Value conforms to data.URI .
                           att.authorized | 
                  
                     | @authority(optional)A name or label associated with the controlled vocabulary from which the value is
                              taken.
                           Value of datatype string .
                           att.authorized | 
                  
                     | @label(optional)Provides a name or label for an element. The value may be any string.
                           Value of datatype string .
                           att.commonPart | 
                  
                     | @n(optional)Provides a number-like designation for an element.
                           Value conforms to token .
                           att.common | 
                  
                     | @xml:base(optional)Provides a base URI reference with which applications can resolve relative URI
                              references into absolute URI references.
                           Value conforms to data.URI .
                           att.commonPart | 
                  
                     | @xml:id(optional)Regularizes the naming of an element and thus facilitates building links between it
                              and other resources. Each id attribute within a document must have a unique
                              value.
                           Value of datatype ID .
                           att.id |