@glyph.auth(optional)A name or label associated with the controlled vocabulary from which the value of
@glyph.name or @glyph.num is taken, or the textual content of the element. Suggested values are: "smufl" (Standard Music Font Layout.)
@glyph.name(optional)Glyph name.
Value is plain text.
@glyph.num(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 conforms to data.HEXNUM.
@glyph.uri(optional)The web-accessible location of the controlled vocabulary from which the value of
@glyph.name or @glyph.num is taken, or the textual content of the element.
Value conforms to data.URI.