| Visual domain attributes. | |
| Module | MEI.shared | 
| Members | grpSym (direct member of att.grpSym.vis)
                | 
| Attributes | @altsym(optional)Provides a way of pointing to a user-defined symbol. It must contain an ID of a
                  <symbolDef> element elsewhere in the document.
               Value conforms to data.URI.
               att.altsym @fontfam(optional)Contains the name of a font-family.
               Value conforms to data.FONTFAMILY.
               att.typography @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 @fontstyle(optional)Records the style of a font, i.e, italic, oblique, or normal.
               Value conforms to data.FONTSTYLE.
               att.typography @glyphnum(optional)Numeric glyph reference in hexadecimal notation, e.g. "#xE000" or "U+E000". N.B.
                  SMuFL version 1.18 uses the range U+E000 - U+ECBF.
               Value of datatype 
                  a string matching the following regular expression: "(#x|U\+)[A-F0-9]+"
                  .
               att.extsym @ho(optional)Records a horizontal adjustment to 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.ho @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 @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 @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 @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 | 
| Declaration | 
                   |