MusicXML display using VexFlow

VeXML represents MusicXML in JavaScript and will eventually allow VexFlow to engrave music using MusicXML input.

Add "vexml" as a subfolder of vexflow. The tests in "runtest.html" will work.

This the hierarchy of classes VeXML uses to represent MusicXML.

• Document

  The highest-level class, which represents a complete MusicXML document.

• StaffSystem

  Draws a system (the group of staves from each part), laying out VexFlow Staves and drawing a bracket.

• Part

  An entire MusicXML part, which can contain multiple staffs (e.g. keyboard), and/or voices.

• Measure

  One measure in one part. The notes may span multiple PartStaffs and/or Voices. By accessing one Measure of a PartStaff or Voice, a new Measure is dynamically created containing only the notes in that PartStaff or Voice.

• PartStaff

  One staff in a part. MusicXML allows voices to use multiple staffs, but this may not currently be possible with VexFlow. A staff element does not exist in MusicXML; this object represents all notes in a part or measure with the same "staff" attribute.

• Voice

  One voice in a part. A voice element does not exist in MusicXML; this object represents all notes in a part, staff, or measure with the same "voice" attribute.

• Note/Chord

  A Note represents a single note element, and a Chord represents a group of note elements which are a single chord.