The following, in order:

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

• <caption> Caption of a Figure, Table, etc., zero or one

• Any combination of:

  • <alt-text> Alternate Text Name (for a figure, etc.)

  • <long-desc> Long Description

  • <email> Email Address

  • <ext-link> External Link

  • <uri> Uniform Resource Identifier (URI)

• Any combination of:

  • <disp-formula> Formula, Display

  • <disp-formula-group> Formula, Display Group