The following, in order:

• <label> Label (of an Equation, Figure, Reference, etc.), zero or one

• <title> Title, zero or one

• <subtitle> Document Subtitle, zero or one

• One or more of any of:

  • <verse-line> Line of a Verse

  • <verse-group> Verse Form for Poetry

• Any combination of:

  • <attrib> Attribution

  • <permissions> Permissions