@color(optional)Used to indicate visual appearance. Do not confuse this with the musical term
                              'color' as used in pre-CMN notation.
                           Value conforms to  data.COLOR.
                            att.color 
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                        @copyof(optional)Points to an element of which the current element is a copy.
                           Value conforms to  data.URI.
                            att.common.anl 
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                        @corresp(optional)Used to point to other elements that correspond to this one in a generic
                              fashion.
                           One or more values from  data.URI, separated by spaces.
                            att.common.anl 
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                        @facs(optional)Permits the current element to reference a facsimile surface or image zone which
                              corresponds to it.
                           One or more values from  data.URI, separated by spaces.
                            att.facsimile 
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                        @fontsize(optional)Indicates the size of a font expressed in printers' points, i.e., 1/72nd of an inch,
                              relative terms, e.g., "small", "larger", etc., or percentage values relative to "normal"
                              size, e.g., "125%". 
                           Value conforms to  data.FONTSIZE.
                            att.typography 
                      | 
                  
                  
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                        @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 
                      | 
                  
                  
                     
                        @next(optional)Used to point to the next event(s) in a user-defined collection.
                           One or more values from  data.URI, separated by spaces.
                            att.common.anl 
                      | 
                  
                  
                     
                        @prev(optional)Points to the previous event(s) in a user-defined collection.
                           One or more values from  data.URI, separated by spaces.
                            att.common.anl 
                      | 
                  
                  
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                        @rhythm(optional)Used to specify a rhythm for the lyric syllables that differs from that of the notes
                              on the staff, e.g. '4,4,4,4' when the rhythm of the notes is '4.,8,4.,8'.
                           Value of datatype  string.
                            att.verse.log 
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                        @sameas(optional)Points to an element that is the same as the current element but is not a literal
                              copy of the current element.
                           One or more values from  data.URI, separated by spaces.
                            att.common.anl 
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                        @synch(optional)Points to elements that are synchronous with the current element.
                           One or more values from  data.URI, separated by spaces.
                            att.common.anl 
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                        @to(optional)Records a timestamp adjustment of a feature's programmatically-determined location
                              in terms of musical time; that is, beats.
                           Value conforms to  data.TSTAMPOFFSET.
                            att.visualoffset.to 
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                        @translit(optional)Specifies the transliteration technique used.
                              
                              
                              
                           Value of datatype  NMTOKEN.
                            att.lang 
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                        @vo(optional)Records the vertical adjustment of a feature's programmatically-determined location
                              in terms of staff interline distance; that is, in units of 1/2 the distance between
                              adjacent staff lines.
                           Value conforms to  data.MEASUREMENTREL.
                            att.visualoffset.vo 
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                        @when(optional)Indicates the point of occurrence of this feature along a time line. Its value must
                              be the ID of a when element elsewhere in the document.
                           Value conforms to  data.URI.
                            att.alignment 
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                        @x(optional)Encodes an x coordinate for a feature in an output coordinate system. When it is
                              necessary to record the placement of a feature in a facsimile image, use the facs
                              attribute.
                           Value of datatype  decimal.
                            att.xy 
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                        @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 
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                        @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 
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                        @xml:lang(optional)Identifies the language of the element's content. The values for this attribute are
                              language 'tags' as defined in BCP 47. All language tags that make use of private use
                              sub-tags must be documented in a corresponding language element in the MEI header
                              whose
                              id attribute is the same as the language tag's value.
                           Value of datatype  language.
                            att.lang 
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                        @y(optional)Encodes an y coordinate for a feature in an output coordinate system. When it is
                              necessary to record the placement of a feature in a facsimile image, use the facs
                              attribute.
                           Value of datatype  decimal.
                            att.xy 
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