Any combination of:

• Text, numbers, or special characters

• Address Elements

  • <addr-line> Address Line

  • <country> Country: in an Address

  • <fax> Fax Number: in an Address

  • <institution> Institution Name: in an Address

  • <phone> Phone Number: in an Address

• Linking Elements

  • <email> Email Address

  • <ext-link> External Link

  • <uri> Uniform Resource Identifier (URI)

• <inline-supplementary-material> Inline Supplementary Material

• <related-article> Related Article Information

• <related-object> Related Object Information

• <break> Line Break

• Emphasis Elements

  • <bold> Bold

  • <italic> Italic

  • <monospace> Monospace Text (Typewriter Text)

  • <overline> Overline

  • <roman> Roman

  • <sans-serif> Sans Serif

  • <sc> Small Caps

  • <strike> Strike Through

  • <underline> Underline

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

• <fn> Footnote

• <target> Target of an Internal Link

• <xref> X (cross) Reference

• <sub> Subscript

• <sup> Superscript